laying down on a bed while playing is not exactly what i would call the best circumstances. first of all ,because it is easy to fall asleep or get drowsy and as we all know playing poker requires your brain to be functioning always at 100%.
Second of all, you cant smoke in bed.(im a smoker) third of all.if ur tired just go to sleep. i know comfort is key when playing poker but i reccomend you go get yourself a nice comfortable desk chair(inclining) and play poker the same way you would be working at an office. at the end of the day, if your a serious player ,you must treat poker as a job and i dont think ive ever seen anyone working in their bed. just my humble opinion.