Lack of sleep, also known as sleep deprivation, occurs when an individual does not get enough restorative sleep. This can result from various factors, including stress, medical conditions, or lifestyle choices. Chronic sleep deprivation can lead to difficulties in concentration, mood swings, and weakened immune function. Over time, insufficient sleep can increase the risk of serious health issues, such as obesity, diabetes, and cardiovascular diseases. The recommended amount of sleep for most adults is between 7 to 9 hours per night. Prioritizing sleep is essential for overall well-being and optimal functioning in daily activities.