I had a bad reaction to an antidepressant that caused me to go for about 6 months with very little sleep 3 years ago. On median, 44 awake, 4 asleep. My record was ~65 hours before sleep. I personally only experienced hallucinations as well at around the high mark. My case was unique in that it was induced by medication causing a chemical change in the brain, not a personal choice, but my mood during that time was quite terrible, and the physical discomfort caused by headaches was extreme.