Meditation
The best-documented tool on this map: training attention. Measurable effects on stress, sleep, and the brain itself.
The word “meditation” covers dozens of practices: attention on the breath, body scans, mindfulness, deep concentration practices, visualizations.
What research says
It is probably the most studied contemplative practice: measurable reduction of stress and anxiety, better sleep, structural and functional brain changes in regular practitioners — including distinctive signatures in brainwaves (frontal theta, gamma in experts).
Why it is everywhere on this map
Meditation is the Swiss army knife of inner exploration: it sharpens the attention needed for dream recall, stabilizes the mind at the edges of sleep, and underpins most deliberate OBE protocols. Ten minutes a day is enough to start.