What are the simple deeds that can be done to obtain great reward, and do performing rak'ahs before sleep suffice for Qiyam al-Layl, and is there a reward for illness?

Calamities are expiations [for sins] and means of raising one's rank. Authentic hadiths have proven that reward is attained merely by the occurrence of a calamity, and this reward increases with patience and contentment. Night prayer (Qiyam al-Layl) begins after the Isha prayer and can be performed in the early, middle, or last part of the night, with the last part being the most virtuous. As for simple deeds with great reward, the sick person can focus on the remembrance of Allah, for "your tongue should remain moist with the remembrance of Allah." They can also engage in da'wah (inviting to Allah) and maintaining ties of kinship via phone, distributing booklets, and having good character, which weighs heavily in the balance [of good deeds].