Watch won't go into sleep mode.

[SICSandbox]

My Galaxy watch won't go into sleep mode. It only goes half brightness and is killing the battery in a matter of hours.  Every time I move my arm it goes bright and 5 seconds later, it goes half bright. Have rebooted and watch is up to date.

[Tallman]

Did you set screen time out?

Open Wearable app -> Display -> Screen time out set to 30 sec.

[SICSandbox]

Yes. Didn't do anything. Seems to have a mind of its own

[Tallman]

Is it GW3? Or GW4?

[SICSandbox]

Neither

[SICSandbox]

I have had it for five years or so. May be time for a new one

[Tallman]

The 1st gen Galaxy Watch?

[SICSandbox]

I think so

[Axton]

Hi, we kindly request you to try a backup and factory reset on your galaxy watch.
We suggest you to access the given link below and follow the given
steps.
For backup your data .
https://www.samsung.com/ca/support/mobile-devices/samsung-smartwatch-back-up-or-restore-your-data/
For Factory data reset .
https://www.samsung.com/ca/support/mobile-devices/samsung-smartwatch-reset/

[SICSandbox]

That did it. Thank you so much for the help.