Insomnia means persistent trouble falling asleep, staying asleep, or waking too early — despite having the chance to sleep. The common signs are: lying awake unable to drop off, waking repeatedly in the night, waking too early, sleep that doesn't leave you refreshed, and the daytime fallout — fatigue, poor concentration, irritability, and low mood. An occasional bad night is normal (transient insomnia); it becomes chronic insomnia when it happens at least three nights a week for three months or more. Insomnia is closely tied to stress, anxiety and depression — each can cause the other — and it's very treatable, so persistent symptoms are worth addressing with a professional.
Insomnia is a sleep disorder involving ongoing trouble with falling asleep or staying asleep. Almost everyone has the occasional rough night — after stress, excitement or exhaustion — and that short-lived kind, transient insomnia, usually passes without lasting harm. It becomes a bigger concern when it turns chronic: difficulty sleeping at least three nights a week, continuing for three months or longer. Chronic insomnia can have environmental, psychological or physical roots, and recognising the signs is the first step to addressing it.
Transient vs chronic insomnia: a few disrupted nights here and there is normal and self-limiting. Chronic insomnia — trouble sleeping at least three nights a week for three months or more — is a recognised condition that benefits from proper assessment and treatment, and it rarely improves just by waiting it out.
The signs and symptoms of insomnia
Trouble falling asleep
Lying in bed, ready to sleep, but unable to drop off — the mind won't switch off, or sleep just won't come, night after night.
Difficulty staying asleep
Waking in the middle of the night and struggling to fall back asleep — sometimes lying awake for long stretches before drifting off again, if at all.
Waking too early
Waking well before you intended or needed to, and being unable to get back to sleep — leaving the day starting on too little rest.
Unrefreshing sleep and daytime fatigue
Even after a night's sleep, not feeling rested — known as non-restorative sleep — and carrying low energy or tiredness through much of the day.
Difficulty concentrating and remembering
Trouble focusing, holding attention, or retaining and recalling information — the cognitive cost of poor sleep, which shows up at work, in studies and in daily tasks.
Irritability and mood changes
Feeling more irritable, short-tempered, or acting impulsively — poor sleep frays emotional resilience, and mood disturbance is one of insomnia's most common effects.
Physical signs — headaches and slowed reflexes
Tension headaches, slowed reflexes, or reduced coordination can accompany ongoing sleep loss — a reminder that insomnia takes a physical, not just mental, toll.
How to check whether you have insomnia
A few simple observations, ideally over a couple of weeks, can help you recognise a pattern:
- Notice how long it takes you to fall asleep — if you're regularly lying awake a long time, make a mental or written note.
- Track your nights — if you wake during the night, note roughly when, and how much continuous sleep you're actually getting.
- Check how you feel by day — whether you wake rested or feel tired, foggy and low through the day.
- Watch your mood — and consider whether the sleeplessness might be linked to something like anxiety or depression, which very often go hand in hand with insomnia.
Why insomnia matters: beyond the immediate tiredness, ongoing insomnia can affect work, studies, relationships and the simple enjoyment of life. Over time, persistent poor sleep is also linked with poorer physical health. The encouraging news is that insomnia is very treatable — and addressing it early, including any underlying stress or anxiety, makes a real difference.
Persistent insomnia is common, treatable, and often closely tied to stress, anxiety or depression — so you don't have to simply put up with it. If you'd like to fix it, see our practical guide on how to fall asleep faster. And if poor sleep has become a pattern, a consultation with Dr. Kohli can help you get to what's keeping you awake — including any underlying anxiety.
Key takeaways
- Insomnia is persistent trouble falling asleep, staying asleep, or waking too early — despite the chance to sleep.
- Signs include unrefreshing sleep plus daytime fatigue, poor concentration, irritability and low mood.
- Occasional bad nights are normal; it's chronic when it occurs 3+ nights a week for 3+ months.
- Insomnia is closely linked with stress, anxiety and depression — each can drive the other.
- It's very treatable — recognise the pattern, then seek help and address any underlying causes.
Frequently asked questions
What's the difference between a few bad nights and insomnia?
Occasional sleeplessness after stress or excitement is normal and passes on its own — that's transient insomnia. It's considered chronic insomnia when the difficulty happens at least three nights a week and continues for three months or more. Chronic insomnia is a recognised condition that benefits from proper assessment rather than just waiting it out.
Can insomnia be a sign of anxiety or depression?
Often, yes. Insomnia and conditions like anxiety and depression are closely connected — each can cause or worsen the other. Sleeplessness can be an early sign of an underlying mental health concern, and treating that concern frequently improves sleep. This is exactly why persistent insomnia is worth discussing with a professional.
How do I know if I should get help for my sleep?
If you regularly struggle to fall or stay asleep, wake unrefreshed, or notice the daytime effects — fatigue, poor focus, irritability, low mood — over several weeks, it's worth seeking help. Insomnia is very treatable, and the earlier any underlying stress or anxiety is addressed, the better.
Is insomnia harmful if left untreated?
Ongoing insomnia takes a real toll — on concentration, mood, relationships and quality of life — and over time persistent poor sleep is linked with poorer physical health too. The good news is that it responds well to treatment, so addressing it rather than enduring it is genuinely worthwhile.
If sleepless nights have become your normal, they don't have to stay that way. Dr. Prerna Kohli can help you understand and address what's keeping you awake — in person in Gurugram and online across India and for NRIs worldwide.
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