Yes, according to the provided reference, you can use clips in conjunction with certain heatless curling methods while sleeping overnight.
The reference specifically details a method using a silk curling ribbon, stating, "You can also clip the two ends of the silk curling ribbon at the top of your head to keep it away from your face as you sleep overnight."
This shows that clips are utilized as part of the heatless curling process during sleep, not necessarily as a primary styling tool applied directly to the hair to create the curl shape itself, but rather to secure the heatless styling device (like the ribbon) in a comfortable position. Clipping the ends helps to keep the ribbon stable and out of the way while you rest, allowing the heatless curls to set overnight without disruption. This technique is focused on securing the styling tool for comfort and effectiveness during the sleeping period.
