Is it normal to laugh silently?
Yep.Totally normal
Yes—silent laughter is completely normal. People laugh in different ways, and some laugh with little or no sound.
Some people’s laughter comes out as a grin, a silent shake, or a breathy wheeze instead of a big noise. It can also depend on the moment: you might be trying not to interrupt, or the joke may just make you smile without a full-on laugh.