(I don't know if this is the right forum, moderators feel free to move it if need be)

Angel and Mia sleep in the crate every single night, there was nothing different about bedtime last night, but in the middle of the night, 2 am-ish, Angel started whining. 

The first time I thought "well she must need to go out really bad" So I let them outside for a few mins and then put them right back in the crate.  No playing, no babytalk happiness, trying to let her know it wasn't playtime and she was going right back to bed.

Then she kept whining the rest of the night.  I would go in the living room to see if everything was ok.  I took her out of the crate and held her, I rubbed her tummy, she didn't feel feverish, just wanted to be clingy.  I put her in back in the crate... because she is not gonna pull this to try to get in bed with us. 

This morning she was extreamly clingy, and she went potty fine and was in a playful mood, she just wouldn't leave my side.  I don't know what's going on.

Any advice?