Long after most children stop taking naps, my daughter still needed them. She required a lot of sleep at night and substantial down-time during the day.
She has a very odd (to me, anyway) way of sleeping. She sits cross-legged, like you would in a yoga class. Then she leans down over her legs, head resting where her calves intersect. Her arms are tucked in the middle, across her waist. I don’t know when we started calling this position “turtle-mode;” I do know it was intended to be descriptive, not mean. She looked like a turtle with all extremities pulled in.
I was NEVER that flexible. It amazed me that she found this position comfortable. (AND STILL DOES!) I also remember her sitting and watching tv with the soles of her feet on either side of her face. She routinely and absentmindedly stretches into positions that amaze me.