It's a fancy dream journal. It doesn't record brain activity.

We will one day have the technology to actually record dreams, however. See https://pubmed.ncbi.nlm.nih.gov/40876481/, Reconstructing high-resolution visual perceptual images from human intracranial electrocorticography signals (2025)

> Reconstruction of visual perception from brain signals has emerged as a promising research topic. Electrocorticography (ECoG) is a kind of high-quality intracranial signal with good spatiotemporal resolution that offers some new opportunities. However, according to our knowledge, there are no studies to reconstruct the perceived images from human ECoG signals at present.

> We have conducted the pioneering work and developed a novel pipeline that integrates Talairach coordinate alignment masked autoencoders (TA-MAE) with denoising diffusion probabilistic models. Our approach exploits the spatiotemporal dynamics of human ECoG signals, enabling the restoration of details in high-resolution