Psychology says:

— if a person laughs too much, even at stupid things, they are lonely deep inside.
— if a person sleeps a lot, they are sad.
— if a person speaks less, but speaks fast, he keeps secrets.
— if someone can't cry, they are weak.
— if someone eats in an abnormal manner, they are tense.
— if someone cries on little things, they are innocent and soft-hearted.
— if someone becomes angry over silly or petty things, it means they need love...

Try to understand people more.