Three factors are required for a late sleep time to be considered bedtime procrastination -

➡️A delay in going to sleep that reduces one’s total sleep time.

➡️The absence of a valid reason for staying up later than intended, such as an external event or an underlying illness.

➡️An awareness that delaying one’s bedtime could lead to negative consequences.

Bedtime procrastination behaviors reflect procrastination in other contexts, such as avoiding doing homework or household chores. Procrastinating on sleep doesn’t usually generate negative associations like those other obligations, however. Instead, sleep may be curtailed in favor of activities that offer more immediate enjoyment, such as watching TV, spending time with friends, or playing video games.

Sleep procrastination can take different forms. One form involves delaying the act of getting into bed. Another is delaying the time of trying to fall asleep once in bed, a problem that has been associated with rising rates of electronic device use in bed. A person may engage in one or both forms of sleep procrastination, each of which can reduce nightly sleep.

Sources - https://www.sleepfoundation.org/sleep-hygiene/revenge-bedtime-procrastination