4 month old started waking at 5am

Tiffany
I guess we've been lucky because our 19 week old has, until now, been going to sleep at 7pm and waking at 730am with a couple of dreamfeeds. For the past few days she's been waking at 5am 😪 she's smiley and will just lie there happily for an hour so I don't think she's overtired or uncomfortable. I feel bad leaving her in her crib for an hour but I don't want to teach her that 5am is a decent wake up time! Do I just have to suck it up and get the coffee on, or do you have any tips?