ZZZzzz...

I think I read this in a history book from the future, but I only remember vaguely, so it could as well be that I just made this up:

"In the beginning of the 21st century society began to change in a way that human history had never seen before. Polyphasic sleep was widely adopted. The usual day-night life cycle as mankind knew it was virtually over. The words day and night were abandoned and people began to talk about phases instead. Even earth's orbit and rotation were altered in a staggering space mission in 2031. Certain people that could not adapt to this new form of life decided to go into winter sleep. But this was only a temporary solution. Many of them finally signed up for cryonic stasis, most of them with explicit demand to never wake them up again. Those people were also called monos (from monophasic sleep) or sloths."