Hi Greg1132,
Bedroom is a place designed for you to rest and re-energize your mind and body. Electrical stuff such as your TV, radio, and computer do not invite the "resting" atmosphere that your bedroom should have. This is the reason why these things should not be positioned in your bedroom.
However, if you really can not avoid it, just make sure you properly turn them off after use. And make sure you do not overuse them
All the best,
Abrys