I agree, i dont see anything wrong personally, with kids watching tv, provided they have other productive type things in their day. Alot of kids programs are quite educational. I tried for months to get my DS to clap, then one day while watching Diego (Dora's cousin) he just started clapping! Theres a part in the show where Diego says clap your hands with me clap clap clap.. and ever since he has been clapping.

If your 2.5 year old is happy to sit and watch whlie you get a few extra z's then definately go for it!!! I remember as a kid my brother and i use to get up and do the same thing every day.