5 yr old suddenly wakes in early hours...

[Chocolatedaim]

My nearly 5yr old started reception at the beginning of September and we had a baby in the summer so she has had a lot going on, and whilst she has seemed her usual breezy self in the day, at night time she is waking at 4am and not going back off to sleep. I’m sure it must be linked to all the changes. My husband and I have tried gently talking to her to see if she is anxious, but she doesn’t seem to be able to tell us. We can’t get a straight answer out of her. She isn’t waking up crying, so no obvious signs of nightmares. We ask her if she has been having bad dreams but she just says no I don’t know why I’m awake.
She goes to sleep well, always has, and is usually a solid 7.30-7 sleeper. Don’t really know how to tackle this as she is shattered. School is obviously tiring enough so when you couple that with 4am start, she is becoming a real grot bag.
We have a gro clock but isn’t really helping, as she just wakes and lies in her bed. She doesn’t get out to play and she doesn’t cry or shout out for us. She just lies there awake, silently, until 7am.
Has anyone got any tips on how we can encourage her to get back off to sleep? Is it best if we don’t make a big deal of it and hope it passes? Any advice is gratefully received.

Just for info: her sibling sleeps with us in other side of house so she can’t be hearing him wake (he is a sound sleeper anyway, I am very lucky!)
We have standard bath, book, bed routine. Always at the same time everynight, give or take 10mins. She does seem hungry more than usual, I suppose that’s school for you, but we try to ensure she just has fruit and healthy snacks.

Hi We had this with our daughter at about the same age..devastating for them being so tired so much of the time. We explored all the standard options and then discovered that (unlike nightmares) night tremors are scary dreams they do not remember. She then had so much adrenaline pumping from the fight or flight response (which doesnt know the difference between a scary night tremor or nightmare and a real life threat) that nothing could get her back to sleep. Prevention rather than cure worked for us .....easy ( parent assisted) Image Rehersal Therapy just before bedtime gets them dreaming about what nice things of their choice (although it takes a week or two to bed in). It is normally great fun....and can also provides a window into your child’s mind as them open up to their choice of www.thedreampillow.co.uk. It came as a bolt out of the blue that our daughter was being bullied by a group of girls in school.