Most adults need about 1.5 to 2 hours of deep sleep per night, which typically amounts to roughly 20-25% of their total sleep time. For someone who sleeps 7-8 hours, this translates to around 105 to 120 minutes of deep sleep. Deep sleep is crucial for physical recovery, tissue repair, muscle growth, and overall health. It tends to decrease with age, and people who are physically active may require more deep sleep for recovery. To summarize:

• Aim for about 1.5 to 2 hours of deep sleep each night.
• This usually makes up around 20-25% of total sleep.
• Adults should sleep at least 7 hours nightly to meet this target.
• Deep sleep supports body repair, immune function, and feeling rested.

If there are issues with sleep quality or waking unrefreshed, consulting a healthcare professional is recommended.