2007-02-05 07:53:09 · 14 answers · asked by donjamste 1 in Science & Mathematics ➔ Earth Sciences & Geology
The simple answer is yes they do.
Whales and dolphins sleep, though remain alert. Seals usually come up onto the shore to rest, though they probably sleep while in the water and remain alert for any danger.
Fish go into a state of suspended animation. While they are in this state part of their brain remains active and they can respond to stimuli such as the arrival of a predator.
When sleeping fish such as those found around reefs will go into a tight crevice where they are relatively safe. Some shoaling fish will just hover on the spot. I have read that plaice will sleep just above the seabed rather than on it. (This is presumably to aviod predation and silt clogging their gills.
Fish also tend to lose their colour at night. When you turn the light on in a tank you will notice that they are a lot paler. External factors will influence the sleep patterns, and they will not sleep if they are hungry.
Insects also sleep or go into a comatose state. In the case of day active species temperature and light intensity dictates when they become active. This is notable in butterflies as you see them more active during warm sunny days, than at dusk or dawn.
Nocturnal species tend to sleep during the day, in sheltered locations, and become active at night.
Insects are also affected by environmental conditions such as temperature and will remain dormant (or asleep) during cold temperatures.
Hope this helps.
2007-02-09 02:05:22 · answer #1 · answered by Tim C 3 · 0⤊ 0⤋
Whales and dolphins sleep with alternate sides of the brain, all marine mammals sleep, even fish sleep. Insects are a little more difficult, they have periods of inactivity, maybe this is a sleep moment?
2007-02-06 14:12:12 · answer #2 · answered by funnelweb 5 · 0⤊ 0⤋
Marine animals and Insects both sleep. Marine animals sleep while movin or they would drown as they have to have a constant flow of water over their gills.
2007-02-06 20:08:46 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Marine animals do not sleep, because to sleep would be to stop moving. They have to have water constantly moving through their gills, so that they can get oxygen. To the best of my knowledge, insects do infact sleep.
2007-02-05 15:55:56 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Every living creature has the need to sleep.
2007-02-05 15:55:23 · answer #5 · answered by MaryBeth 7 · 0⤊ 0⤋
Yes but rarely together!
It also depends on what you class as sleep!
2007-02-05 15:54:49 · answer #6 · answered by Robb the B.D.C. 5 · 0⤊ 0⤋
Everyone sleeps
2007-02-05 15:55:32 · answer #7 · answered by Anonymous · 0⤊ 0⤋
Of course they do. They need rest just like all creatures do
2007-02-05 15:55:50 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Yes they do
2007-02-05 15:55:34 · answer #9 · answered by Dr Universe 7 · 0⤊ 0⤋
yes
2007-02-05 16:02:39 · answer #10 · answered by styce 4 · 0⤊ 0⤋