Maverick, where are you?

You know that part in "Top Gun", towards the end, when there's a big dog fight and Maverick is too scared to engage? Everyone keeps shouting, "Engage, engage" and "Maverick, where are you?" Yeah, somedays that's how I feel. I have the greatest kids, but I just can't seem to engage in play with them. It's like my head is in a fog or something, I just can't concentrate (or rather turn my brain off) long enough to play. Some days are really great, we play in the playroom and build towers and have tea parties, whatever. Other days, I just want them to be amused by the TV. These kids love me and love to be with me, and all I want is some peace and quiet, time to myself. I feel so torn, because I don't want them to be neglected, but sometimes I just don't want to be with them. Then I feel like a bad mom. Ugh.