Dave lies in bed for a full hour each night before falling asleep and then proceeds to wake up multiple times throughout the night. he most likely has what sleep disorder?

The answer is "insomnia".

Insomnia refers to a sleeping disorder that is described by trouble falling or potentially staying asleep. Individuals with a sleeping disorder are accompanying these side effects, which are difficulty in sleeping and awakening regularly during the night and experiencing difficulty to sleep again. A sleeping disorder can be caused by mental and medicinal conditions, undesirable rest propensities, particular substances, as well as certain organic elements.