5 month old falls asleep around 1 AM, how to keep her entertained late at night

So I am the primary caregiver for my 5 month old baby girl and generally watch her for 9 hours while my wife is at work and 3-4 more hours at night after my wife falls asleep and before baby falls asleep. Baby is VERY active in between 10 PM and 1 AM. I'm a little stumped on how to keep her entertained when frankly, I am very drained from the day and going a little stir crazy. You can only give a tour of your 2 bedroom house so many times and I just don't have the energy to bounce on the medicine ball (her two favorite activities) at midnight after being up for 17 hours.Any advice on the matter would be wonderful! via /r/Parenting https://ift.tt/3zi2jnk