My LO is 5 months old. He was sleeping through the night for several weeks and then we had the 4 month shots last week. He was up almost all night. He then caught a cold the next day and was up just once during the night. Well he is still up once at night and I'm starting to get worn out! I know that this is normal, but I'm just curious about how long it should last and just wanting to see who else is going through this.