When should you go to bed to wake up rested?

Every medication on sipra is prescribed by a licensed physician, so your care always starts with a visit. Your sipra membership gives you ongoing access to those physician visits, so you can check in, adjust your plan, and ask questions whenever you need, without paying per visit. It is how we keep high-quality care convenient: one membership, physician access whenever you need it, and support at every step.

Almost never. The National Sleep Foundation 2015 expert panel placed 6 hours at the boundary of the "not recommended" range for adults 18 to 64. Long-term observational studies show that habitual sleep under 6 hours is associated with higher all-cause mortality, cardiovascular disease, obesity, and impaired cognitive performance. A small percentage of adults (under 3%) genuinely function well on 5 to 6 hours; most who report doing so are sleep-deprived and adapted to it.

On average, but individual cycles run 80 to 110 minutes, and the same person's cycles vary across a night. Earlier cycles tend to be shorter (with more deep sleep); later cycles are longer (with more REM). The 90-minute calculator math is a useful planning tool but should not be treated as precise. Aim for the right total duration; cycle alignment is a bonus.

Two common reasons. First, the last cycle of a long sleep often ends with you waking mid-REM, which feels groggier than waking at a cycle boundary. Second, if your normal sleep is 7 hours and you stretch to 9 on weekends, the schedule shift is essentially mild jet lag. Consistency across the week matters more than the absolute number on any one night.

Consumer wearables estimate sleep stages with moderate accuracy (overall agreement with polysomnography in the 60% to 80% range, varying by stage and device). They are useful for tracking patterns over weeks but should not be used for clinical decisions. If a tracker suggests you have a sleep disorder, get a real sleep study before drawing conclusions.