I used to have trouble sleeping as a kid, was always the last one wide awake at the sleepovers; always up at the end of a teenage conversation with a girlfriend noticing she had passed out like an hour earlier an hour later (maybe my convo was that boring).

After my first kid, I've had no problem at all catching and cherishing a nap. Dreams, I think, are the brains garbage collection mechanism. Without them, the system just grinds to a halt.