itching heard it blood flow?!

Roisin • 💕🐶👶🏼
Ok
Itching on a night is becoming a problem. 
All my bedding is clean on, all my pyjamas are too. I haven't swapped any fabric condition or any shower/bath stuff. 
I've read itching is normal due to having more blood flow in your body? 
It starting to become a problem as I'm not sleeping :( 
Anyone else had the same problem?