The following text is from Thomas Metzinger’s 2009 book ‘The Ego Tunnel – The Science of the Mind and the Myth of the Self’.
Maybe you’ve had a lucid dream yourself; the phenomenon is not rare. If not, you can try a number of different induction techniques. For instance, you can adopt the habit of performing “reality checks” several times a day. Each reality check should last at least a minute. It consists in carefully inspecting your current inner and outer environment for any indications that this might not be ordinary waking reality. Here is a checklist that readers interested in exploring the dream tunnel can use as a guideline.
If you perform reality checks of this type several times a day, you have a good chance or eventually becoming a lucid dreamer. By pure habit, you will one day perform a reality check in a dream – and if you are lucky, you will correctly realise you are dreaming.