In Islam, wudu (ablution) is a ritual purification performed before certain acts of worship, such as prayer. Whether or not sleeping invalidates wudu depends on several factors, including the duration of sleep and the circumstances. Here are some points to consider regarding the impact of sleep on wudu:

1. Minor Sleep: Minor sleep, where one dozes off briefly or unintentionally, does not invalidate wudu. This means that if you briefly close your eyes or nod off involuntarily, your wudu remains valid.
2. Deep Sleep: Deep sleep, where one loses awareness of their surroundings, does invalidate wudu. When a person experiences deep sleep, they are considered to be in a state of impurity, and they need to renew their wudu before performing acts of worship.
3. Duration of Sleep: The duration of sleep matters. According to some scholars, if you sleep for a brief period with your body still in an upright position (e.g., sitting or leaning against something), your wudu may remain valid. However, if you sleep lying down or reclining, even for a short period, it is generally considered to invalidate wudu.
4. Exceptions: There are exceptions to the rule of deep sleep invalidating wudu. For example, if someone is in a state of janabah (major ritual impurity, usually due to sexual activity or nocturnal emission) and falls asleep, their wudu is not invalidated by sleep alone.
5. Intentional Sleep: If you intentionally take a nap or go to sleep, your wudu is invalidated, regardless of the duration of sleep. You will need to renew your wudu before performing acts of worship.
6. Uncertainty: In situations of uncertainty, it is recommended to renew wudu to ensure its validity before performing acts of worship. It’s better to be cautious and maintain ritual purity.
7. Renewing Wudu: Renewing wudu is a simple process that involves washing specific body parts, such as the face, hands, mouth, nose, and feet, with water. It is performed to purify oneself before acts of worship like prayer.

It’s important to note that interpretations of these rules may vary among different Islamic schools of thought. Some scholars may have slightly different views on whether and how sleep affects wudu. It’s advisable to follow the guidance of your particular school of thought or consult with a knowledgeable religious authority for specific questions related to wudu.