Suddenly 3:40am is party time! So we sleep trained our 5 month old daughter and she took to it really well and for about 2-3 weeks she would go to bed at 7pm and sleep until 6-8am. All of sudden a week and a half ago she started waking up at 3:40am to the minute and just stays awake quietly for about 30-40 minutes and then she starts to cry and I check on her every 10 minutes of crying. I will only check on her a maximum of twice because after a few minute she falls asleep for a 5 minute stretch so I reset the timer. Around 4:40-5am she falls back asleep until 6:30-7:30 am.

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Is there a way to help her get through this waking period, it's weird to me how consistent it is all of a sudden. Will this just eventually pass?

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I read that maybe going in before she wakes at 3:40am and readjust or wake her calmly it will maybe reset her sleep but waking a sleeping baby scares me...