What happens if I cast the Command spell and command a creature to “Sleep”?

I came across this post about casting the Suggestion spell and telling the creature to "sleep". I wanted to know if there was any official ruling for what would happen if you cast Command on someone and tell them to "sleep".

There seem to be people that think it makes the target fall asleep… But from my understanding of it, the target would just lie down for 6 seconds, try their hardest to fall asleep, and that’s it.

Since it takes the average person 7 minutes to fall asleep, they’d still be wide awake after you use the Command spell on them. Correct?