Ringlets - I had them as a girl - went to bed with a head full of torn rags often.
Here's how to do it-
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Grab an old sheet or a couple of old t-shirts - it doesn't matter what the rags are made from, as long as they're natural fiber, and lint-free! For an average head of hair and for typically sized ringlets, you'll need about 40 rags. Cut or tear into strips about an inch wide and about 6 inches long (longer if you've got long hair).
If you have hard to curl hair, you'll also need some setting lotion or lightweight gel.
Shampoo and condition your hair as usual, and let it dry until it's barely damp. If your hair hates to hold a curl, fingercomb some setting lotion through it. If you don't have the time or inclination to wash your hair, use a mister to dampen your hair instead.
Section your hair into 1/2" - 1" sections
Take one of your rags, and lay it alongside a section of hair so that about an inch of the rag is above the roots.
Smooth the strand of hair, and wrap it around the rag in a spiral. Wrapping the hair tightly will give you tighter curls, Wrapping the spiral tighter (using less of the rag) will give you springier curls. Leave yourself at least an inch at the bottom of the rag.
Tie the two ends of the rag together making sure that the ends of the strand aren't sticking out anywhere, and you're done with your first rag! Finish up the rest of the sections of hair and tie them off neatly.
It's time for bed! Go ahead and sleep on your rags. If you left your hair a bit wet, you might consider putting a towel over your pillow - but make sure it's a well-used one, so you don't end up with towel-lint in your curls.
When you wake up the next morning, gently untie your rags - you'll end up with some wonderful sausage curls. A quick spritz of gentle-hold hairspray, and maybe a pretty scarf tied into a headband, and you're ready to head out the door with some great curls. If you'd prefer less obvious ringlets, gently comb through each curls with a wide-tooth comb once or twice, then through your whole head of curls.
But "My Bar" is a name, and quite catchy too.