Quick! Would you let him sleep?

My 3 year old usually sleeps from about 8pm to 7am. For some ungodly reason he was awake at 4am this morning. He doesn't nap so he just fell asleep about of the blue about ten minutes ago. I mean he is sound asleep! What would you do, would you let him sleep or force him awake till a little bit later? This is out of character for him so I am at a loss, but I am also SO tired myself.

Let him sleep and get some sleep yourself.

i would wake him up. He is going to be up for a while. I cant let my 1 year old nap after 6 because he will be up till like 1 thinking its party time

Let him sleep. What time is it there though?

It is 5, he has been asleep about 20 minutes. I'm just going to let him sleep I guess and get to bed early myself.