You know, this is a good question.

Googling it would ruin the fun, but I’d assume that it’s an evolutionary thing so you don’t decide to go to sleep in an unsafe situation and get yourself eaten.

Or dance to sleep

So sleep is a complex process influenced by many factors, including genetics, environment, and our body’s natural processes. While we can’t just decide to be asleep, we can take steps to create a sleep-friendly environment and develop healthy sleep habits to help us fall asleep easier.

A related question might be, are there people who can deliberately make themselves sleep? For example, those that can close their eyes and just sleep in seconds. Are they falling asleep, but just faster than most, or do they decide to sleep?