False starts

My little girl is a great night time sleeper (so not complaining at all!) BUT she is having false starts to her nighttime sleep. She goes down well and sleeps for 45mins - 1 hour then she’s awake and takes ages to go back to sleep. I keep the room dark, white noise on, don’t talk to her etc until she eventually drifts on. So whilst I’m so grateful she sleeps through the night, I spend all evening on edge waiting for the false starts then rest of the evening sat in a dark room while my dinner goes cold downstairs 🫠 any tips? I’ve had to let her have a shorter nap at like 5:30pm and half a feed then too, so she will still want her normal Bedtime feed and a good wake window. I feel like the late afternoon naps / feeds are to blame but not sure? Any tips on false starts very welcome! X