If your pillow is too high, you'll easily wake up with a stiff neck.
Tips
mistakes
Note the tone: 落 here is read 'lào' (4th tone), not 'luò.' This 落 reading is reserved for a few set expressions — 落枕, 落色 (lào shǎi, 'fade'), 落价 (lào jià, 'drop in price').
memory
Literally '(head) drop / land on pillow' — but the meaning is the unhappy result: pillow at the wrong angle, neck pays the price the next morning.
