The Salaah of a Sick Person:
If a person is unable to perform Salaah standing, then he should perform it while sitting down, making Rukoo` and Sujood. If he is unable to make Rukoo` and Sujood as well, he should just gesture with his head (declining it) for Rukoo` and do so a bit lower for Sujood.
Note: He should not lift anything up to his head and make Sajdah on it.
If the person is not able to perform Salaah even sitting, then he should perform it while lying on his back and facing his legs towards the Qiblah, and just gesturing (with his head) for Rukoo` and Sujood. If he is laying on his side and his face is towards the Qiblah, and he is gesturing with his head (for Rukoo` and Sujood), his Salaah is valid.
If the person is unable even to gesture with his head, then he should delay the Salaah (until he gets better). He should not gesture (for Rukoo` and Sujood) using his eyes, or his heart, or his eyebrows.
If a person is able to stand (in Salaah) but is unable to perform Rukoo` and Sujood, then it is not necessary for him to stand. It is permissible for him to perform the entire Salaah sitting, and he will gesture (with his head for Rukoo` and Sujood).
If a healthy person performs part of his Salaah standing, and thereafter he becomes sick and is no longer able to stand, he should complete the rest of the Salaah while sitting, performing Rukoo` and Sujood if he is able to, or gesturing (with his head) if he is unable to perform Rukoo` and Sujood, or lying on his back if he is unable to sit.
If a person is performing Salaah while sitting down due to an illness, and thereafter becomes healthy again during the Salaah, he should complete the rest of it while standing up (like normal).
If a person is performing his Salaah while making
Eemaa' (gesturing with the head) for Rukoo` and Sujood because he is not able to do them, and thereafter becomes able to do them during the Salaah, he should repeat that Salaah (and do them).
If a person falls unconscious or into a coma and this lasts for the duration of five Salaats or less, he will make Qadhaa of (repeat) them when he wakes up. However, if this condition lasts for more than five Salaats, then he does not need to make Qadhaa.
[
Mukhtasar al-Qudoori fil-Fiqh al-Hanafi.]
والله تعالى أعلم