The position of the load, fulcrum, and effort are in different spots. In a first class lever, the fulcrum is between the load and effort. In a second class lever, the load is â¦between the force and fulcrum.
By the age of about 75, stage four sleep and delta waves may be entirely absent. In addition to a decrease in the incidence of delta waves during slow-wave sleep in the elderly, the incidence of temporal delta wave activity is commonly seen in older adults, and incidences also increase with age.
As the sleep cycle repeats during the night, you re-enter this drowsy half-awake, half-asleep stage. Stage 2 (10-25 minutes). After a few minutes, your brain activity slows further, and you descend into light sleep. On the EEG monitor, this stage is characterised by further slowing in the waves with an increase in their size, and short one or two-second bursts of activity known as âsleep spindlesâ.