Passage: When it comes to sleep quality, overall duration is important, as is the cycle of
sleep states. Sleep consists of five different states, the first four of which are
non-Rapid Eye Movement (NREM) sleep, with the fifth being Rapid Eye
Movement (REM) sleep. When individuals fall asleep, they move through the
four stages of NREM sleep, with the stages getting deeper progressively,
resulting in the sleeper becoming less likely to awaken due to external stimuli,
before moving to REM sleep, when most dreaming occurs. The cycle of these
five stages is essential for sleep quality.
Assignment:
What can be done to improve sleep duration and quality?

Read the passage. (1) the first skateboard was constructed of old roller-skate wheels attached to a piece of wood. (2) improvements were made to the skateboard in 1959. (3) the year that the first commercially made skateboard appeared. (4) soon after, skateboarding began to grow in popularity. (5) in 1963, skateboard manufacturers formed the first professional skateboarding team. (6) that same year, the first organized skateboard competition took place, in california. which is the most effective way to correct the fragment in sentence 3? attach the fragment to sentence 4. attach the fragment to sentence 2. insert the phrase in the united states to the end of the fragment. insert the verb had before the verb appeared.