Excessive sleep lasting beyond 9 or 10 hours weekly can raise the risk of developing diabetes by as much as half, according to studies summarized by scientist Yulia Neverova, a senior lecturer at Perm National Research Polytechnic University. Too little sleep at night, on the other hand, leaves people exhausted, reduces performance, drains attention, and weakens immune defenses. These observations come from Neverova who has spoken publicly about how sleep shapes daily functioning and long-term health. Attribution: Yulia Neverova, Perm National Research Polytechnic University.
Neverova notes that records show a person can go without sleep for roughly 19 days, a figure popularized by the Guinness Book of Records. Yet the consequences of insufficient nightly rest appear early. Irritability and trouble concentrating may show up within the first day. By the second and third days, coordination of movements, eye focus, and clarity of speech begin to falter. By the fourth and fifth days, the user may experience vivid hallucinations, and by the eighth day even simple words become difficult to pronounce. Attribution: Yulia Neverova, Perm National Research Polytechnic University.
Irregular sleep patterns disrupt circadian rhythms, leaving a person in a constant state of fatigue. Mood and performance suffer, concentration wavers, and the immune system weakens. Depression can set in, and insomnia may follow. These are not abstract risks; they translate into daily life as more mistakes, slower reaction times, and a greater sense of being overwhelmed. The idea is that sleep is a key regulator of mental and physical stamina, with sleep debt accumulating if nights are short or irregular. Attribution: Yulia Neverova, Perm National Research Polytechnic University.
Sleep disorders can extend beyond fatigue. Neverova highlights that sleepwalking, a parasomnia, can occur when restorative sleep is compromised. During the night, some individuals move or perform tasks such as washing dishes or pacing, then return to bed. This pattern reflects the body’s attempt to extend deep sleep and gain more rest, even while the person is technically asleep. Attribution: Yulia Neverova, Perm National Research Polytechnic University.
Overly long sleep also carries risks. Regularly sleeping more than 9 to 10 hours may raise the chance of developing diabetes by about 50 percent. There is also concern for cardiovascular health, which can be affected if people become less active and more sedentary during longer sleep windows. The takeaway is not simply to chase a set number of hours but to aim for a consistent, balanced sleep routine that supports overall wellbeing. Attribution: Yulia Neverova, Perm National Research Polytechnic University.
Consistent, excessive sleep can interfere with daytime responsibilities, leaving less time for work and chores. The rush to catch up on rest can crowd out important tasks, leading to irritability and mood dips. Maintaining a steady sleep pattern helps preserve energy for daily duties and reduces the risk of backlogs creating stress or depressive feelings. It is important to recognize that sleep health connects to daily performance, mood stability, and the ability to manage tasks without feeling overwhelmed. Attribution: Yulia Neverova, Perm National Research Polytechnic University.
Beyond individual symptoms, the discussed findings often align with broader discussions about chronic fatigue and sleep-related health concerns. The evidence suggests that staying on a regular schedule, seeking professional guidance when sleep issues persist, and adopting practical routines can support both physical health and mental clarity. In short, sleep quality and quantity matter just as much as daily activity and nutrition. Attribution: Yulia Neverova, Perm National Research Polytechnic University.