Wikipedia has more on Noctiphobia
Noctiphobia is the fear of night. Unlike many other phobias, noctiphobes may not impact their lives much, but simply be up and active during the day and sleep all through the night. Noctiphobia is very related to nyctophobia (fear of the dark), so they may have same reactions between the two, like being afraid of evil creatures lurking in the dark waiting to attack.
