Just that, really!
DD is an early bird. Sometimes she'll play happily in her room when she wakes for 30-45 mins before coming to get us. Other times, she'll come racing through as soon as the suns up, ready to start the day!
DH has suggested getting a Gro Clock which I'm up for in principle, but I think that at 20 months she's a big young to really get it. Her understanding is generally good (e.g she can follow two-part instructions and can be reasoned with in simple ways (if you do x then I'll do y).
Would love to hear your experience!