How does a single eyelid suddenly turn into a double eyelid?

Single eyelid suddenly into double eyelid skin may be caused by excessive use of eyes, lack of sleep, upper eyelid edema, but also suspected to be caused by cardiogenic edema or nephrogenic edema. Need to go to the hospital ophthalmology examination, diagnosis of specific causes. Rest as much as possible, local use of towels for hot compress.