Quote from Starrychelx
Is it true that only one person has to sleep to where it can be day time when your playing multiplayer, because I've seen videos that had that happen.
When on multiplayer everyone who is online has to sleep for it to fast forward today time. If youre the only one online then just you, otherwise, everyone has to do it.
To explain what you saw, many server use a Bukkit plugin that makes it so the night skips when only one player is in bed.