Take a hot shower then quickly go outside wheres its cold.you'll get sick but nothing serious. Sleep deprivation. Too much exercise( jogging for 1 hour) Original Song: The Chainsmokers : https://www.youtube.com/watch?v=eACohWVwTOc No Copyright infringement intended. Subscribe to my channel for more! Yes.
Drinking too much water( fluids will dump good nutrients too) Focusing ur attention on forehead when eyes are closed.ull get a headache but nothing serious.