Baby scratches her scalp before sleep

Danielle 💜 • 💍 JACK 09.08.18 👶🏻 LILY 12.20.19 💊 HG SURVIVOR

Whenever she is trying to fall asleep she reaches up and scratches away at her own scall, almost like shes trying to grab her hair too (though she doesn't have much yet). Is this normal?? She is completely fine otherwise...