Dreaming while awake: dream-like states are not only sleep

What the study tested

The team focused on sleep onset, the unstable transition where attention loosens but inner experience can remain vivid. Participants were interrupted either by a dropped hand-held object or by an alarm, then immediately described the previous ten seconds of thought. EEG tracked brain activity throughout the session.

This design captures fragile material: single images, phrases that appear by themselves, odd scenes, body sensations or practical plans. Instead of forcing reports into fixed categories, the researchers used data-driven clustering around bizarreness, fluidity, spontaneity and felt wakefulness.

Four states instead of a clean border

The analysis did not simply separate “dream” from “waking thought.” It identified four patterns: fleeting recall, environment-connected thought, bizarre dream-like content and voluntary planning. Crucially, every pattern appeared across wakefulness, sleep onset and light sleep.

For dream journaling, that matters. Hypnagogic images, strange nap fragments and late-night dreams may belong to a broader continuum. Recording them together makes it easier to see how your mind builds scenes as vigilance shifts.

What this changes for dream journaling

If you only record long narrative dreams in the morning, you miss useful material. A single image while dozing, a strange sentence or a floating body sensation can point to the same themes as a full dream.

The useful move is to record context: was this while awake, drifting off, after a nap or on morning waking? Then add bizarreness, emotion and your sense of control. Those fields make later pattern review much clearer.

The limits to keep in mind

The study does not claim wakefulness and sleep are the same. It shows that mental content can cross those categories. Reports remain subjective, and a lab nap is not identical to an ordinary night at home.

Still, for people who track dreams, the takeaway is grounded: fragments count. They may be the first visible trace of how the brain turns memory, expectation and sensation into dream imagery.