Need A Night Nanny For Weekdays

We have two boys 21 months old. They used to sleep really well at night. But recently one of them has started with sleep regression, and around 2 or 3 a.m. he is up for 2 hours daily. He is not fussy, he is just awake and wants to be held. We need someone who can just sooth him back to sleep. We don't need to feed them or change diapers or do anything else. We just need to retrain him to go back to sleep, which I guess we are not successful with.