Double Eyelid? Sometimes i have it and sometimes i dont?

So when i wake up in the morning, i have hooded eyes, as in you cant see the crease of my eyelid. it sux cuz the skin covers some of my top lashes, and it looks weird. Im not asian btw, im european. But after exercising or dancing, i get a double eyelid. If ive worked really hard, i do sweat and my face feels a bit moist and so my eyelids fold differently hence, the double eyelid. Ive tried putting Aveeno lotion on my eyelids but i still get hooded eyes. lol do i really have to perspire a bit on my face to get a double eyelid?????