Insomnia warning signs include mood shifts, fatigue and micro‑sleeps.

A University of Maryland study and sleep specialist Dr. Saema Tahir identify persistent daytime fatigue, mood instability and brief microsleeps as red flags that sleep may not be restorative.

Researchers at the University of Maryland highlighted daytime thinking, fatigue and mood as 'residual' symptoms linked to insomnia. The article reports these signs can indicate that sleep is not restorative even when the total time in bed appears adequate. Dr. Saema Tahir, a sleep specialist, explains how each symptom can point to different sleep problems, from poor sleep architecture to untreated sleep disorders. The piece also notes experts discussed common sleep‑hygiene measures as part of broader conversations about sleep quality. What the study and experts noted: - Researchers identified three daytime domains — thinking, fatigue and mood — as residual symptoms tied to insomnia. - Persistent daytime fatigue describes low energy and reduced alertness despite adequate time in bed, and may signal poor restorative sleep or circadian misalignment. - Mood instability includes irritability and emotional reactivity and was linked to disrupted REM sleep or altered emotional‑regulation circuits. - Microsleeps are brief, involuntary episodes of sleep or blank spells and were described as a safety‑related sign of severe sleep deprivation or untreated sleep disorders. - The article reports experts also described common sleep‑hygiene measures such as setting a regular bedtime, a wind‑down routine, morning light exposure and dimming lights in the evening. Summary: The reported finding is that daytime function — including persistent fatigue, mood changes and brief microsleeps — can be more informative than hours in bed for assessing sleep health. The article states that when these signs notably affect daily functioning, the source recommends consulting a healthcare professional; further diagnostic or treatment steps were not detailed. Undetermined at this time