Hey guys just looking for some advice

!
I am a 21 year old male and I have a PWS across the left side of my face! I have been having treatment all my life but something has always baffled me!
When I wake up in the morning my PWS is always sagged and swollen almost! It lasts for about 5 hours for it to return to its normal size and its
always confused me why! I assume that it's due to blood circulation or something similar but I have always wanted a solution for it as it bugs me more than the PWS itself sometimes haha!
If anyone has a similar problem or know of any advice please help! It would be greatly appreciated
Thanks guys!!