Sorry for the late reply. You should look in to opera singing, while they have a strong support for their voice and often can sing laying down. Anna Netrebko lies down while singing a lot of times in La Traviata, that you can watch fully on youtube.
Some tips from me is that your breath control is the most important thing next to your diaphragm. You can start with training on a s or f; just breath in and count up to 15, next 20, then 25 and then 30 seconds of breathing out. For your diaphragm you can try to hold something heavy, so that your body supports your voice while singing. Your diaphragm should be open all the time you sing and while you breathe you can relax it.
If you think about those two things while doing your singing exercises it should improve, but it depends on your amount or training. If you feel your voice is getting tired, just take a break and start again in 2 hours or the next day.
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