The context of the following conversation is Sasha laughed in their sleeve to hide their face. Sasha didn't want anyone to see.:
Sasha says I'm always so embarrassed when I laugh..
The friend responds You were cracking up just an hour ago!.
Sasha responds Yeah, but I hid my face in my sleeve so nobody would see..
The friend responds Why are you so insecure about laughing in front of people?.
Sasha responds I don't know. It's just a part of my personality..