Sleep

Sleep is a state of unconscious rest needed by a wide variety of species across the Arcane Realm, including.
During sleep, most systems in an animal are in an anabolic state, building up the immune, nervous, skeletal, and muscular systems.
REM sleep was a stage of sleep necessary to most beings. If a person did not get the acquired amount, there could be repercussions, ranging from depression, exhaustion and hallucinations all the way to a possible psychotic break. Lack of sleep would induce less effective performance and a bedraggled appearance in hominins, although other species might manifest a lack of sleep differently.

Anthroids could, in a manner of speaking, also sleep when they entered a powered-down state from time to time.

Sleep Patterns

The internal circadian clock promotes sleep daily at night in diurnal species (such as hauflins) and in the day in nocturnal organisms (such as bakeneko). However, sleep patterns vary widely among animals and among different individual humans. Industrialization and artificial light have substantially altered the sleep habits or urban races.
The most striking differences are between societies that have plentiful sources of artificial light and ones that do not. The primary difference appears to be that pre-light cultures have more broken-up sleep patterns. For example, people without artificial light might go to sleep far sooner after the sun sets, but then wake up several times throughout the night, punctuating their sleep with periods of wakefulness, perhaps lasting several hours.
The boundaries between sleeping and waking are blurred in these societies. Some observers believe that nighttime sleep in these societies is most often split into two main periods, the first characterized primarily by deep sleep and the second by REM sleep.
Some societies display a fragmented sleep pattern in which people sleep at all times of the day and night for shorter periods. In many nomadic or hunter-gatherer societies, people will sleep on and off throughout the day or night depending on what is happening. Plentiful artificial light has been available in the industrialized regions and sleep patterns have changed significantly everywhere that lighting has been introduced. In general, people sleep in a more concentrated burst through the night, going to sleep much later, although this is not always true.

Sleep habits across races

Hominins, Giants
Diurnal sleep cycle typically from 6 to 8 hours for adults depending on lifestyle. Newborns for all species require a lot of sleep up to 18 hours with declining rates as they age.
Fairies
Fairies have sleep cycles similar to most humanoid newborns until childhood. At this point their sleep becomes much more fragmented and only sleeping for a few hours (2-3) at a time all through the day though focused mainly at night. They slip back into a concentrated sleep pattern once their bodies prepare for their shift to adult size, when they revert to their napping pattern.
Merfolk
Merfolk have sleep patterns similar to hominins at a glance. However, sleep patterns are easily disrupted and may even disappear during periods of migration, spawning, and parental care. It is noted that merfolk that often travel via ocean currents often move with repetitive movements and very low response, called "sleep swimming".
Lamiae
Lamia periodical have periods of naps where they bask by a heat source, which makes their equivalent to a sleep time relatively short in comparison.
Harpies
Harpies are diurnal species with the exception of strigine harpies. Strigine are much more active from dusk until dawn, as most of their prey are traditionally nocturnal.
Anthroids
Anthroids require a period of very little response and rest called "sleep mode". They vary in their length but those that perform more stressful tasks require longer sleep modes.
Henge
Henge species will often have the same circadian cycles as their natural counterparts. As such nocturnals are usually still night time creatures and vice-versa.

Spirits
Spirits on their own have no need to sleep, they are typically sleepless. Spirits that expend more energy that they gather will typically slow down for brief periods of time.
However a spirit can engage in the act of sleeping. A spirit can even be conditioned to sleep on a regular schedule if they find the process enjoyable.

Sleeping locations

People of many species sleep in a variety of locations. Some sleep directly on the ground; others on nests of leaves and sticks with tree branches; others on a skin or blanket; others sleep on platforms or beds. Some sleep with blankets, some with pillows, some with simple headrests, some with no head support. These choices are shaped by a variety of factors, such as climate, protection from predators, housing type, technology, personal preference, and the incidence of pests.
In cities, hotels were businesses designed to provide a place to sleep and stay the night for travelers.

Dreams

Some species experienced dreams while they slept. During sleep, especially REM sleep, people tend to have dreams: elusive first-person experiences which despite their frequently bizarre qualities seem realistic while in progress. Dreams can seamlessly incorporate elements within a person's mind which would not normally go together. They can include apparent sensation of all types, especially vision and movement.