If you go to sleep with no itchy spots and wake up with them, you may have bedbugs, especially if you just purchased a used bed or other used furniture. Bedbugs may also show other symptoms, such as:
Your pillows or sheets have blood stains.
On sheets, mattresses, bed linens, and walls, there are dark or rusty streaks that are bedbug excrement.
Bedbug feces, eggshells, or shed skins in bedbug hiding places
The scent glands of the bugs emit a repulsive, musty smell.