Behavioural adaptations of a ringtail possum include: 1  They nest in hollows in trees, enabling them to stay clear of predators. 2  When habitat is cleared, they adapt quickly and easily, moving into the roof space in houses, or any other available space such as dog kennels or fireplaces. They nest in hollows in trees, enabling them to stay clear of predators. 2  When habitat is cleared, they adapt quickly and easily, moving into the roof space in houses, or any other available space such as dog kennels or fireplaces.
Here your body functions slow down even more. Your brainwaves become longer and slower as your body prepares for the next stage of sleep. NREM Stage 3. Stage 3, also known as slow wave sleep is the last stage of sleep. Here your body is in a deep sleep. Waking someone from this stage would be pretty difficult and if you managed it, they would feel very groggy, tired and disoriented.
Stages of Sleep. Usually sleepers pass through five stages: 1, 2, 3, 4 and REM (rapid eye movement) sleep. These stages progress cyclically from 1 through REM then begin again with stage 1. A complete sleep cycle takes an average of 90 to 110 minutes.The first sleep cycles each night have relatively short REM sleeps and long periods of deep sleep but later in the night, REM periods lengthen and deep sleep time decreases.n stage 4, the brain produces delta waves almost exclusively. Stages 3 and 4 are referred to as deep sleep or delta sleep, and it is very difficult to wake someone from them. In deep sleep, there is no eye movement or muscle activity.