Several options exist that might help you out.
Some red dots auto switch offf 15 minutes or so after they're placed in darkness.
Get one with a regular battery & carry a spare at all times on the gun. (this is what I do & I automatically swap the batteries & buy a new spare every birthday so I don't forget)
There are a couple of "luminous" ones that light up by being exposed to sunlight as well, IIRC they're called "firefly" sights.
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