Answer:
They come out at night without being called, and are lost in the day without being stolen. What are they?
A prehistoric reptile that lives today and the inspiration for the name of a popular sports drink.
I have joy in bringing two together, but darning my existence! My life hangs by a thread, filled with ups, downs and resistance!
You're currently trying to solve one
How can a pants pocket be empty and still have something in it?
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.