RE-TIMER Sleep Glasses User Manual page 10

*Generally, using the for up to 59 minutes
in the morning for 3–4 mornings in a row will help
you move your body clock so that you wake up
earlier. Ensure you use your earlier each
morning until you reach your desired wake up time.
**Conversely, using the before
bedtime will help move your body clock so
that you naturally begin to go to bed later.
If you are seeking a significant time advance or
delay (for example, 5 hours) you may choose to
use the for up to 7 days in a row.
Note:
Using this product shortly before bed
may prevent you falling asleep immediately.