These are the Gods and Goddesses that are listed in Konstantinos' "Nocturnal Witchcraft", and I will be listing a few of my own. The definitions given here are generally word for word frmo Nocturnal Witchcraft: Magick After Dark.
The deities fall into categories which I will be using here, to make it easier to classify them.
Call on these for basic nocturnal works and thoughtforms, dream magick, skrying or visualization help.
Hypnos: Greek God
His name is the Greek word for sleep, and the realms of sleep and dreams are his to command. It is likely that many ancient Greeks called on him for help with dream incubation, although he is also helpful in matters of recieving, in dreams, simple answers to questions. His mother is the ultimate embodiment of night in Greek Mythology- Nyx.
Nephthys: Egyptian Goddess
She has been called upon to aid in rites of every basic type listed here. The mother of Anubis and helper of all dark workings, sheis a pure nocturnal deity, also encompassing some lunar, Underworld, and even protective aspects. Call on her for most anything after sunset.
The mother of Hypnos, the Furies, and several other Gods, Nyx is the embodiment of nocturnal ether in all its forms. She is one of the first beings to emerge from Chaos, according to a creation myth. In the beginning there was night, indeed. If you call on a universal form of the Goddess of Night, you will be tapping into much of Nyx's energy. Seek her out for help with most anything Nocturnal.
Call on them for attuning with the Dark Moon, banishings, and any kind of positive but destructive magick, such as healing.
Hecate: Greek Goddess
The "Beloved of Zeus" is arguably one of the oldest deities known to the Greeks and, as a Crone aspect, may essentially be the mother of the pantheon. Great power and wisdom abound in Hecate, and she is often considered the Goddess of Witchcraft. Use her intense magickal aid when you have serious needs. She is part of a triad of Goddesses (see Selene, Full Moon Goddess).
Morrigan: Celtic Goddess
Her symbols are two related carrion birds, the crow and te raven, either of which she often disguised herself as. Like other Dark Moon Goddesses here, Morrigan is no typical crone, and one you find yourself imagining being mature yet vibrant. She has reigned over battlefields when necessary, "destroying" the harmful effects of the opposing armies. Morrigan can add fierce power to any banishing rite.
Pasht: Egyptian Goddess
This dark form of cat-headed Bast is associated with destructive magick. No crone, Pasht can brin the power of feline nimbleness and persistence to a Dark Moon rite, making your desired effect manifest regardless of the types of obstacles it encounters.
The father of Inanna, Nanna was often called the Lord of Wisdom. On of the few male lunar deities in the world, Nanna represents a unque perspective to rituals that feel somehow male, yet which clearly fall under power of the Full Moon. Many Pagans only associate the moon with female energy, but as everything else there are male and female energies present. Imagine the different type of energy a God would bring to a lunar fertility rite, especially one for a man. Nanna can also be called in conjunction with his wife, Ningal, to have balanced polarity in a lunar rite.
Ningal: Sumerian Goddess
Inanna's mother and Nanna's wife. As the Sumerian pantheon was called and worshiped a dark magickal system, you may find that Ningal and the other Sumerian deities feel "right" to you.
Selene: Greek Goddess
As mentioned, Hecate is part of a triad of Goddesses (and not the only triad in Greek mythology. Think Furies.) For those who become comfortable working with the crone Hecate, calling on mother Selene at the time of the Full Moon may seem natural. The maiden aspect, Diana, can be invoked in a rite that will be performed before the moon reaches Full, and Selene can then be called on to finish such an increasing or drawing rite.
Call on them for protecton, of course, but also for ensuring that karma keeps people in check when they deal with you. These happen to be the Goddesses I feel most connected with.
Furies (Alecto, Megaera and Tisiphone>: Greek Goddesses
Another triad of Goddesses, these daughters on Nyx are known as the Angry Ones. Alecto can best protect you against unseen enemies. Megeara should be called when you know someone is harboring ill will toward you. The most severe, Tisiphone can help you ensure that someone who wrongs you becomes fully aware of the consequences that the universe has in store (not consequences you send this person's way).
Kali: Indian Goddess
Describing the appearance of Kali is not easy. Most see her as something nightmarish, ranging from a fanged woman with four arms to such a figure with a necklace of skulls and blood upon her. Yet the harsh image is only a representation of the role she takes on: that of a fierce protector. (I personally tend to disagree with that image, as she chose me as her "child" so to speak, and since I have seen her only as a very beautiful, ice-pale woman with black eyes and white or black hair.)
Call on her when you feel truly endangered.
Call on them for help in facing your own shadow self, approaching the unseen world, and obtaining wisdom.
Inanna (Ishtar and Astarte in later cultures): Sumerian Goddess
While archaeologists have argued as to why this beloved Goddess descended into the Underworld, it is clear she managed to emerge more powerful than when she entered. Despite being a multifaceted Goddess, Inanna can help you figureout how to handle most challenges from which you may need to emerge changed. Look into her myths to see the vast range of energies she represents.
(On a personal note, when I was going through the worst 5 years of my life, it was she who was with me, helping me emerge not unscarred, but a better person for it.)
Khepera: Egyptian God
This beetle-headed God represented rebirth into a new existence. Call on his nocturnal form when you feel the need to let a part of yourself die so that a new part may be reborn. Wear a scarab beetle charm or ring to remind yourself of such an endeavor.
Kore/Persephone: Greek Goddess
Innocent Kore was dragged into the Underworld by Hades and eventually tricked into becoming his consort for part of each year- for what became the cold months. Upon the realization of her new role, she took on the name Persephone. Call on Kore when you feel blind to the effects of some forces in your life. Call on Persephone when you need guidance with come new part of your life that has begun and which you wish to control.
Call on them for an understanding of the afterlife, and for help in communicating with the Dead.
Anubis: Egyptian God
Anubis can help one achieve understanding of the Underworld. His jackal eyes possess much wisdom, and through the loop in his ankh one can see eternity and the souls who live on.
Ereshkigal: Sumerian Goddess
As a darker aspect of a powerful Goddess, Ereshkigal reminds us that Death is not evil, but just another aspect of existence. Some of the melancholy nature of Feath as a being comes through in her tale, for Ereshkigal did not choose her role. She was handed it, and must perform it to maintain the cosmic balance.
Hades/Thanatos: Greek God
Interestingly, Hades is described as ruling over an Underworld where the Dead can either be in happiness (as in Summerland), or surrounded by lesson-teaching sorrows they've brought on themselves (the lower realm). Invoke him to understand this aspect of the hereafter. To understand the process of moving on, you'd do better calling on Thanatos, who may very well be another face of Hades, as Thanatos has been called the Lord of the Dead, and not just he who ushers them away.
Three Fates (Clotho, Lachesis, and Atropos): Greek Goddesses
The three fates symbolize the afterlife process that souls go through. Invoke them to learn about each phase of the process. Clotho creates or "life thread", or helps us determine the kind of life we need to enter. Lachesis measures the lenght of it, determining how many important challenges and experiences will come our way. Atropos cuts the life thread to carry us back to the afterlife when it is all over, making Atropos another type of traditional Death.