there is a few ways to do this out of bed, one way is to download free static programs like this one,
http://forums.deeperblue.net/showthread.php?t=67375. i have also been doing apnea walks. i set myself a goal to walk in one breath and if i feel good when i hit that stage then i further my goal. this might be a good thing for u. i have gone from 47sec static to 2:00min static in about 2-3weeks. but if ur on ur own, dont do any training in the pool.
hope this helps, happy training
cheers!
