Please note: This can cause Photosensitive epilepsy in some people, depending on the frequency chosen.

More info about Dreamachines

You can try a dreamachine right here in your browser: Start Dreamachine.

For a proper effect sit rather close to the monitor, and remember to close your eyes.

Monitors are not as bright as light bulbs, so turning off the room lights, and making the monitor the only light can help too.