Any tips for working and training your voice in bed?  I love singing, but have never done it in public other than a few times in a community play, and church.  I've been extremely ill the last three years and bed ridden and not even able to sit up about 75% of the time.  Needless to say my muscles have deteriorated horribly, and my voice is much weaker as a result.  Earlier today I wanted to sing a song for a friend and send it to her because her mom died suddenly and I couldn't be there, and I was surprised at how shaky my voice felt singing.  I ended up writing a blog about it and posting it here: https://steemit.com/music/@justkeepitreal/me-singing-in-my-bed
But if you have any God vocal excersizes for laying on your back in bed to build up breath control?   
Thank you!