Drowsiness can be caused by not getting enough or proper sleep, working at night and sleeping during the day, excessive use of smartphones, especially during night, drug addiction, smoking, drinking, lack of physical activity, obesity and the use of certain anti-allergy medications.

Anti-allergy medications, such as diphenhydramine, brompheniramine, hydroxyzine, antidepressants, anxiety medications, are known to cause drowsiness.

Drowsiness is usually treated or managed by medications such as modafinil and armodafinil. These medications act by altering the action of certain chemicals in the brain. Loss of excess weight, regular physical exercise and changes in diet are also essential for treating drowsiness.

It is highly dangerous to drive while feeling drowsy as the chances of accident increases. Both lack of sleep and drinking alcohol can have similar effects on your body.

Self-help tips for drowsiness are getting a good night's sleep by going to bed and waking up in the morning at the same time every day of the week; avoiding daytime naps; and having a warm bath or shower before going to bed. Loss of excessive weight by regular exercise and yoga can also be advantageous.