Ensure that the source text is in a language you do not understand.
Go to bed early.
Under moderate light, start reading the source text.
Be sure to follow every word of the text; do not read it as a series of letters but allow your mind to (try to) parse the text as it would with a language you understand.
Persevere until your eyes begin to feel heavy and your brain feels as though it is rubbing against itself.
Allow yourself to fall asleep, whenever it seems to come naturally.
In the morning, linger in bed and, if possible, drift off to sleep again.
Repeat for several nights until the meaning of the source text is revealed to you in your dreams.