Question: I spend my day in Ramadan asleep or at rest since I am unable to work due to my (experiencing) severe pangs of hunger and thirst, so does this affect the validity of my fast?
A- This does not affect the validity of the fast, (rather) therein is an increase of reward due to the saying of the Messenger (peace be upon him) to ‘Aisha (may Allah be pleased with her): “Your reward is according to your hardship.”
So, the more hardship a person experiences, the more his reward increases. He should (also) do what he can to reduce the effect of fasting such as cooling himself with water and resting in a cool place.
– Sheikh Ibn ‘Uthaymeen, Fatawa Ramadan – Volume 2, Page 522, Fatwa No.487, Fatawa Ibn ‘Uthaymeen – Volume 1, Page 509