Final answer:
The nurse would recognize daytime naps as very common among preschoolers, and they typically need about 10-13 hours of sleep per night.
Step-by-step explanation:
The nurse would recognize daytime naps as very common among preschoolers, so option (a) is correct. Preschoolers typically need about 10-13 hours of sleep per night, so option (b) is not accurate. Partial awakening leading to sleeplessness can be common among preschoolers, but it is not considered a normal sleep pattern, so option (c) is incorrect. About 50% of sleep time in preschoolers is spent in non-rapid eye movement (NREM) sleep, so option (d) is not accurate either.