Final answer:
Lack of sleep can cause physical and mental health issues, as well as safety risks.
Step-by-step explanation:
Three problems that can be caused by lack of sleep include:
- Physical health issues: Lack of sleep can lead to obesity, increased blood pressure, weakened immune system, and increased stress levels.
- Mental health issues: Sleep deprivation can cause depression-like symptoms, irritability, poor cognitive function, and impaired judgment.
- Safety risks: Sleep-deprived individuals may experience difficulty staying awake or have slower reflexes, which can put themselves and others at risk when driving or operating machinery.