Guard duty

There's always one who watches during the night to alert the others to imminent danger, This feat allows you to:

Wake sleeping party members to action with no penalty to movement

Grants Dark vision out to 20 feet in dark as if it were bright, and to 30 feet as if it were dim 

You only need to sleep for 4 hours a night to maintain your watch but you can only do this for 2 nights in a row or you suffer 1 level of exhaustion per night (above two) in a row you use this feat, which you need a full long rest to recover from.