O man! Mine were all back to back and it seemed like they New the baby was near and they trying to get the attention before baby arrives. When my daughter was born my 2yr old digressed and became whiny and stopped using potty my now 1 1/2 yr old screams and throws her pasifier out the crib just so we can walk back in! The baby makes us really tired so at night we just do give up with putting them back in their beds until they are asleep. After some time they will get the picture and baby will hopefully sleep through the night with them on the same schedule! Good luck

I’m not preg but my 2 year old stays up till 1 and my 4 starts crying every night about 2 I do have a 3 month old though I get no sleep