Lucid dreaming is a state of consciousness in which the dreamer is aware they are dreaming while still asleep. That awareness opens the door to shaping the dream from inside it. The phenomenon has been studied seriously since the 1970s, and researchers have identified several reliable techniques for inducing it.
MILD — mnemonic induction of lucid dreams
MILD was developed by Stephen LaBerge, the Stanford researcher whose work made lucid dreaming a respectable subject in sleep science. The technique: before falling asleep, repeat the intention "next time I'm dreaming, I want to remember that I am dreaming" while visualizing a successful lucid-dream experience. Done consistently, MILD increases both the rate of lucid dreams and dream recall in general.
WBTB — wake-back-to-bed
WBTB exploits the architecture of sleep itself. Wake up in the middle of the night, stay alert for a short period (15–60 minutes), then return to sleep. The brain is unusually susceptible to lucidity during the hypnagogic transition between wakefulness and sleep, so the controlled re-entry biases the next REM cycle toward awareness.
Reality testing
The third common technique trains awareness during waking hours so it persists into the dream. Throughout the day, observe your environment for anything unusual. Look at clocks twice (digits often shift between glances in dreams). Look at your hands. Walk through a doorway, touch it, and ask whether you're dreaming. Reality testing can lead to a dream-initiated lucid dream (DILD), where lucidity arrives mid-dream — and intense, vivid dreams are far more likely to trigger DILD than dull ones.
Dream yoga in the Buddhist tradition
Buddhism — particularly the Tibetan tradition — has recognized lucid dreaming for over a thousand years and treats it as a vehicle for spiritual practice. The dream is understood as a vivid demonstration of the constructed nature of experience; lucidity within the dream becomes practice for lucidity within waking life. Dreaming Yourself Awake: Lucid Dreaming and Tibetan Dream Yoga for Insight and Transformation by B. Alan Wallace is a thorough modern introduction.
A note on astral projection
Astral projection is sometimes mentioned alongside lucid dreaming, but the two are distinct. Lucid dreaming is awareness within the dream state; astral projection is the reported experience of consciousness separated from the physical body. The traditions and the techniques only partly overlap.
Lucid dreaming is empowering precisely because it is teachable. With MILD or WBTB, anyone with a regular sleep schedule and a few weeks of patient practice can begin to access it.