Is it necessary to repeat ablution after relieving oneself or drinking water at night, if one had gone to sleep in a state of ablution?

Ablution before sleep is a recommended act. If ablution is broken before sleeping, it is not obligatory to repeat it because it is not a duty. The purpose of this is to sleep in a state of purity, out of fear of dying during the night, and for visions to be truer and further from the devil's tampering. There is a difference of opinion regarding the permissibility of prayer with this ablution; the correct view is that if one intended to sleep in a state of purity by it, then prayer and other acts are permissible. There is also a difference of opinion on whether this ablution is broken by an event (that nullifies ablution) occurring after lying down. The relied-upon view is that it is broken by an event that precedes lying down and by one that follows it. Getting up to drink water does not break ablution.