Many websites and youtube videos makes getting to this state seem so hard and complicated; in truth it's really not and once someone has achived it once doing it again seems easy and natural...as simple as day dreaming.
Start by laying down on your back with your arms to your sides. Make sure the room is quiet and dimly lit. Close your eyes and visualize a small light out in the darkness straight in front of you, and hold your focus on this light.
Breathe normaly not to deep not to shallow. For now try your best to keep your mind totaly clear of thought. On an inward breath visualize everything around you getting darker - on your outward breath feel your self sinking into the darkness. Keep sinking and sinking into this darkness. Let your body become numb. (Remember to stay perfectly still while doing this...don't move a muscle). Sink deeper and deeper until all sense of your body is gone.
You should begin to feel yourself wanting to drift into sleep. Slowly take all thought away from how you are breathing; clear your mind once again of everything. Try to let no thought enter. Stare strait ahead out into the darkness at your small little light. Let your mind drift off. If thoughts come in let them (just don't consciously create them.) Let your mind wonder and zone out. Begin to think of a place or create a dream; imagine the little light exspanding and becoming your place or dream. (Most say to focus hard on creating a dream focus on every little detail...) I say this is wrong! Keep your thoughts light and far apart; to much conscious thought will keep you awake and away from a dreaming like state.
Let your self fall into a dream. I even find when doing this...and I decide to roll over on my side and quit I still wind up in a lucid mind awake body asleep state.
Good luck.