Is this normal sleep...?

Not super worried yet, because that's not the kind of person I am... But I'm wondering if I should be.

My girl is about to turn 4 months, and she is generally good about sleeping at night. Wakes up for 2-3 feeds, but otherwise sleeps ok.

Maybe since two weeks ago, though, she is... Extremely restless while sleeping. She rolls onto her side and back, and twists and kicks, and - this is the part that's concerning me - scratches her head A LOT. She sometimes wakes herself up from how much she's scratching.

Now, I know there's an active stage to sleep, and sometimes I feel like the twisting and turning is gas, because she calms down a bit after a good fart...

But the scratching is confusing me.

First of all, she doesn't scratch her head while awake. She usually only does it when sleepy or sleeping. She does it with this wild desperation that feels like she's REALLY itchy, but if she's wide awake she won't even bother to touch her head, which makes me doubt that there's actually an issue.

Any advice? Is this normal?