Valich, thank you for your kind words. In answer to your query of what is happening to your foot when you use the computer and it falls asleep, we can answer that for you. Avatar was correct with his reply but to go into greater detail, when pressure is exerted upon your leg while at the computer you are applying pressure to an arteries therefore starving you’re your tissues with fresh glucose / oxygen carrying blood. As well as compressed arteries you could also be blocking nerve pathways, reducing the signal strength to the brain. When you reopen these pathways some nerves fire hyperactively causing something which should feel like a burning or prickling sensation referred to as pins and needles. This in turn then fires an instinctive response in mammals to shake the affected part therefore increasing blood flow and minimising damage. Taking drugs to excess, especially sedatives such as alcohol or opiates causes organisms to remain still for excessive periods of time, especially while sleeping. This can cause a condition known as Radial Neuropathy (emergency room staff prefer to call this Saturday Night Palsy) where areas are deprived of essential nutrients for a long period of time. The result is either temporary or permanent nerve damage to the affected area.