Happy
you would call someone chuckles when he or she laughs and there tummy bounces up and down
Someone who laughs all the time can be described as "jovial" or "jolly." They may also be referred to as a "laughing person" or simply as someone with a cheerful disposition. In a more informal context, you might call them a "laughaholic."
A person who laughs alone can be called a "solitarian" or simply someone who enjoys their own company and finds joy in their own thoughts.
Smilee smiler well someone in my class is called Sarah smillie so we call her smiley Sarah
When you can't sleep you might have insomnia so a person who can't sleep might be called an insomniac.
annoying
Nothing You Just Want Be Able Too Sleep Much AS You Would Like
nitwt
It is when someone laughs hysterically
Sakuden Anrakuan has written: 'Laughs to banish sleep'
it laughs when it eats someone
yes it is normal