is sleep voluntary or involuntary?

sometimes when I lie down I'm just out and other times I take sleep aids to even fall asleep. I just woke up thinking that I should sleep more often and then I though wait that's dumb and I don't think I can control that. Now, I think it's dumb because I can control that is it voluntary or no
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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