Why did my Apple Watch Series 6 ask me to "Turn Digital Crown to unlock" when I'd been nowhere near water?

This is related to the sleeping mode. The sleeping mode "locks" the watch and turns the brightness down a lot so that the watch does not disturb you during your sleep.

You can change your sleep shedule right on the watch.

To do this, follow these steps:

• Open the Sleep app on your Apple Watch.

• Tap Full Schedule, then do one of the following:

  • Change a sleep schedule: Tap the current schedule.
  • Add a sleep schedule: Tap Add Another Schedule.
  • Change your sleep goal: Tap Sleep Goal, then set the amount of time you want to sleep.
  • Change Wind Down time: Tap Wind Down, then set the amount of time you want sleep mode to be active before bedtime.

  To reduce distractions before your scheduled bedtime, sleep mode turns on during Wind Down. Sleep mode turns off the watch display and turns on Do Not Disturb.

• Do any of the following:

  • Set the days for your schedule: Tap your schedule, then tap the area below Active On. Choose days, then tap Done.
  • Adjust your wake time and bedtime: Tap Wake Up or Bedtime, turn the Digital Crown to set a new time, then tap Set.
  • Set the alarm options: Turn Alarm off or on and tap Sound to choose an alarm sound.
  • Remove or cancel a sleep schedule: Tap Delete Schedule (at the bottom of the screen) to remove an existing schedule, or tap Cancel (at the top of the screen) to cancel creating a new one.

You can also disable automatic sleep mode in the watch settings app:

Taps sleep and tap Sleep Mode, then turn off this option to manually control sleep mode in Control Center.