Does the Compression Garment Help More During the Day or During the Night?

I had slim lipo (w/small stiches) on my arms and wore the compression garment 24/7 for about 1.5 wks; I now wear a light spanx sleeve to work when I can't do long sleeves. I'm still swollen (I hope) but it is improving. I have read after 1-2 wks (my surgeon recommended 2 wks) you should continue wearing it 12 hrs a day. But is the 12 hours more "helpful" at night during sleep or during the day when you are up and about? It feels tighter when I wake up and loser during the evenings.