Do you have anything prepared for this? Do you say, no but come back in a week?
Do you say, yes, here are four pre-gen character sheets, let’s play a random short one-shot?
Do you say, no we’d need to spend time prepping for D&D but here’s a simpler tabletop game which uses minis and dice, let’s play this right now instead? (for example, Shadowdark)
Or something else?
Roll over and check to see what time it is on my phone. If it’s within 20 minutes of when I get up, I’ll probably go ahead and shower and make breakfast. If it’s more than an hour before my alarm I’d definitely try to go back to sleep.