This lesson is less prescriptive than the previous ones, and that is intentional. Winding down is personal. An activity that relaxes one person may not work for someone else, so the program does not prescribe a single routine.

The general principle is simple: give yourself time to move gradually from the activity of the day toward sleep.

Sleep does not begin the moment you decide to switch it on. Your level of alertness needs time to decrease. The hour before bed is when that transition can happen.

Highly stimulating activities can keep your mind and body alert when they need to begin slowing down. These may include:

• Checking or answering work emails.
• Having difficult or emotionally charged conversations.
• Planning, problem-solving or making several decisions.
• Doing intense physical exercise.
• Using stimulating screen content until the moment you get into bed.

Less stimulating activities can help create a gentler transition. You might try:

• Reading a physical book.
• Having a quiet conversation.
• Doing some gentle stretching.
• Taking a bath or shower.
• Listening to calm music.
• Choosing a simple craft or activity that keeps your hands occupied without demanding too much attention.

Screens deserve a separate explanation. The blue-spectrum light they produce can suppress melatonin, the hormone that helps signal to your body that it is nighttime.

This effect is real, but it is often overstated. The content you consume can be just as stimulating as the light, and sometimes more so. Reading the news or using social media at 11 p.m. may keep you alert mainly because of the thoughts and emotions it creates.

The practical goal is to create a buffer between your day and your bed. It does not need to be an elaborate ritual or look the same every evening.

It simply needs to be a period in which stimulation gradually decreases rather than increases.