You're probably getting more sleep than you think

When researchers measured insomniacs in a sleep lab, the patients underestimated their actual sleep by about an hour every night.

You wake up in the morning and the first thought is: I barely slept. Maybe two hours, maybe three. The night felt like a long, unbroken stretch of staring at the ceiling.

Then you go through your day, and somehow you're functional. Tired, yes — but functional. You manage meetings. You drive without crashing. You think reasonably clearly. You wonder, briefly, how that's possible after "two hours of sleep."

There's a good chance you slept more than you think. Possibly much more.

This isn't a guess. It's been measured.

The Stanford study

In a now-classic study at the Stanford University Sleep Clinic, 122 people with chronic insomnia spent the night in a sleep lab so their sleep could be measured precisely with brain wave recordings. In the morning, they estimated how long they had slept. The estimates were compared with the actual recordings.

The result: on average, the insomniacs overestimated the time it took them to fall asleep by 30 minutes and underestimated their total sleep time by an hour.

These weren't small errors. They weren't off by ten minutes. They were missing an hour of their own sleep, every night, in their own subjective experience.

This phenomenon has a clinical name — sleep state misperception, sometimes called paradoxical insomnia — and it's now recognized as a common feature of chronic insomnia. Some people have it more dramatically than others. But almost everyone with insomnia has it to some degree.

Why this happens

There are two main reasons your sense of how much you slept tends to be wrong.

1. Stage 2 sleep doesn't always feel like sleep.

Adults spend roughly 50% of the night in Stage 2 sleep — the lighter, but still genuine, sleep stage. If you're awakened from Stage 2, especially briefly, you'll often insist you weren't really asleep. You might say you were "just resting" or "drifting." That feeling is wrong. Stage 2 is a real sleep stage, with real restorative function. But it doesn't always feel like the deep, dreaming, "knocked out" sleep that people imagine when they think of "real sleep."

When insomniacs report waking up frequently during the night, they often did wake up briefly — but they also went back to Stage 2 sleep within seconds. They're remembering the awakenings and not the sleep around them.

2. Time perception is distorted in unpleasant situations.

This one is universal. Subjective time runs slow when you're uncomfortable and fast when you're enjoying yourself. A boring meeting feels like it lasts forever. A great conversation seems to fly by.

Lying awake in bed at 3am, frustrated and wanting to sleep, is one of the most subjectively-slow experiences possible. Every minute feels like five. So when you estimate how long you were awake during the night, your estimate is going to be inflated — sometimes dramatically.

The reverse is also true. Time spent in Stage 2 sleep, where you're partly conscious of sounds and sensations but not fully alert, can pass quickly without you fully registering it. A stretch that feels like 15 minutes of "just lying there" was probably an hour of light sleep.

What this means in practice

If you wake up in the morning convinced you barely slept, here are two things to consider:

The math probably doesn't add up. If you genuinely got 2-3 hours of sleep night after night for years, you would not be functioning. You would be in clear medical distress. The fact that you're getting through your day reasonably well is itself evidence that you're sleeping more than your subjective sense suggests.

On nights when time seemed to pass quickly even though you weren't sure if you were asleep, you almost certainly were. This is a useful reframe. Many insomniacs spend nights wondering "was I asleep or just lying there?" If time felt like it moved, you were probably in Stage 2.

Why this matters for the night ahead

The most useful thing about understanding sleep state misperception isn't the morning — it's the next night.

A lot of insomnia is fed by the belief that you're not sleeping. That belief produces anxiety. That anxiety produces arousal. That arousal makes sleep harder. So the cycle continues.

If you can shift the belief — I probably slept more than I think I did. The night wasn't as bad as it felt. I'm not running on three hours — you take some of the pressure off. Less pressure, less arousal, more sleep.

This is also why sleep tracking with wearables can be a mixed blessing for insomniacs. The data sometimes confirms what people fear (which doesn't help) and sometimes contradicts it (which helps a lot — many insomniacs are surprised to see they slept 6.5 hours on a night that felt like three).

The takeaway

The night you remember and the night that actually happened are often two different things. Most insomniacs underestimate their sleep, sometimes by a lot. Knowing this won't fix insomnia by itself, but it can take some of the catastrophizing out of bad mornings — which is one of the better gifts you can give yourself when you're trying to sleep better.

Lull is a calm bedtime audio app for adults with insomnia, designed to help you fall asleep without overstimulation. Free at lullstories.com.