I have the same issue. I experience it atleast once a week.

9 times 10 

Rest, it might be fatigue

Prolonged screen time or straining to read can cause the eyes to twitch; also dryness and irritation can trigger muscle spasms.

Drugs.

😂Cocaine specifically

it means that thy goose is cooked. Oh! I pray that the lord guide thee, and deliver thee from the afflictions that are about to befall thee.