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Use Rag Strips
Gather some strips out of any fabric you have around the house. Dampen the ends of your hair with a spray bottle and twist a section at a time around each strip until you reach the scalp. Tie each strip place as you go. Sleep on your rag rolls, and remove them in the morning. Find a tutorial on A Beautiful Mess. So easy, and won't damage your hair.
Alternate Direction With an Iron
If you're into waves and not ringlets, clasp your hair a couple of inches below the curling iron's clasp, and then vary the direction you wrap as you go — turning both toward your face and away. And to keep hair from getting too curly, leave the ends out of the iron, according to Advice From a Twentysomething.
Twist Two Sections of Hair
When your hair is slightly damp after washing, split it into two sections, one on either side of your head. Twist the first section from root to tips, bringing the ends to the crown of your head and clipping in place. Do the same with the other section, bringing it to the crown so it sits alongside the first twist. Use the same clips to hold both pieces in place. In the morning, just remove the clips and whip your hair a little, spraying a bit of hairspray for extra hold if you like. Find the whole tutorial with pictures at Pretty Gossip.
Create Mini Buns
Create irregular sections of hair using zigzag parts, apply mousse and secure each into a tight mini-bun. Blow dry the buns, and let them cool before removing the pins to release into tousled waves, according to Total Beauty.
Try a Flat Iron
Using a flat iron to create wavy hair kind of sounds like an oxymoron, right? But it totally works. It's best to use one that's skinny with rounded edges, and gets somewhat hot on the outside of the plates. Twist sections of hair away from your fact while clamping down. Comb through for desired waviness, according to the Hair and Makeup by Steph approach.
Braid Wet Hair
This method works great when you start with wet hair right out of the shower in the evening. Just comb through and braid (use French braids for waves that start at the top) in one-inch sections or so, and go to sleep. In the morning, unbraid your dry hair and comb through with only your fingers for natural-looking waves, according to Wikihow.