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Sleep research has entered a new era — and some of its most surprising findings are coming out of Harvard Medical School. A neurobiologist named Dragana Rogulja has spent years studying the fundamental biology of sleep, and her findings are changing how scientists think about what actually happens when we close our eyes.
Here's what her research has uncovered — and why it matters for how you think about your own sleep.
We spend roughly a third of our lives asleep. Go without it for long enough, and the consequences become severe — cognitive function drops, immune response suffers, and eventually, the effects become life-threatening. Yet despite sleep's critical role in health and survival, science still doesn't fully understand why we need it.
For a long time, sleep was treated as a passive state — a kind of standby mode for the brain and body. More recent research has complicated that picture significantly.
Dragana Rogulja, an associate professor of neurobiology in the Blavatnik Institute at Harvard Medical School, has been pursuing two central questions about sleep:
Her lab uses fruit flies and mice as research models — organisms that share enough biological similarity with humans to yield meaningful insights about sleep mechanisms.
"Sleep is one unified state, but it seems to have multiple components that are regulated through separate mechanisms. We want to understand those mechanisms." — Dr. Dragana Rogulja, Harvard Medical School
One of the most striking findings from Rogulja's research is the link between sleep and the gut microbiome — the vast community of microorganisms living in the digestive system.
Her lab found that sleep deprivation doesn't just affect the brain. It leads to measurable changes in gut microbiome composition. These changes appear to have downstream effects on metabolism and immune function.
This connection points toward something important: sleep isn't just a brain event. It's a whole-body process, and disrupting it affects systems well beyond the nervous system. Research on the gut-sleep relationship has opened new pathways for understanding sleep disorders and potential interventions.
The practical implication: chronic poor sleep may affect more than how tired you feel. It may have ripple effects on digestive health and immune response.
When you fall asleep, your brain doesn't just go quiet — it actively builds a barrier against sensory input. This is what allows you to sleep through ambient noise that would wake you if you were conscious.
Rogulja's research explores the mechanisms behind this sensory threshold elevation — understanding what raises the barrier between the sleeping brain and the outside world, and how that barrier is maintained throughout the night.
Sleep is now understood as an active process, not a passive one. During sleep, the brain is engaged in:
"For a long time, sleep has been considered as a passive state where nothing much happens," Rogulja told Harvard Medicine News. "But now we know that sleep is an active process, and the brain engages in a variety of functions during this state."
The practical takeaway from Rogulja's work isn't that you need to overhaul your life. It's that sleep deserves to be taken seriously as a physiological necessity — not a luxury or a variable you can compress without consequences.
A few things worth considering:
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Neurobiologist Dragana Rogulja's lab at Harvard is studying two main questions: why sleep is essential for survival, and how the brain blocks out sensory input during sleep. A notable recent finding is the link between sleep deprivation and changes in gut microbiome composition.
Research from Rogulja's lab found that sleep deprivation leads to changes in the community of microorganisms in the digestive system. These changes can affect metabolism and immune function, suggesting sleep impacts whole-body health — not just the brain.
Active. While sleep looks like a passive state from the outside, the brain is engaged in memory consolidation, cellular waste clearance, neural reorganization, and other critical processes during sleep. The brain also actively maintains a sensory barrier to prevent disturbances from interrupting the sleep state.
During sleep — particularly during certain sleep stages — the brain consolidates information from the day, transferring it from short-term to long-term storage. Disrupted or insufficient sleep interferes with this process.
Yes. Physical discomfort from a poorly suited mattress can trigger micro-arousals — brief disturbances that interrupt sleep cycles without fully waking you. Over time, this reduces sleep quality and the restorative benefits of sleep. If you wake up stiff, sore, or unrefreshed, your sleep surface is worth evaluating. Learn more in our mattress buying guide.
Reduced cognitive function, impaired immune response, changes in gut microbiome, increased risk of metabolic disorders, and in extreme cases, life-threatening neurological breakdown. The research underscores that sleep is not optional maintenance — it's a biological necessity.
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