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Q: Do flys sleep, and where do they go to sleep? ( Answered,   0 Comments )
Subject: Do flys sleep, and where do they go to sleep?
Category: Science > Earth Sciences
Asked by: ebok-ga
List Price: $2.00
Posted: 11 Dec 2005 16:55 PST
Expires: 10 Jan 2006 16:55 PST
Question ID: 604566
Flys are only ever around during the day, do they sleep at night, and
where do they go to sleep?
Subject: Re: Do flys sleep, and where do they go to sleep?
Answered By: tlspiegel-ga on 11 Dec 2005 19:20 PST
Hi ebok,

Thank you for your question.

"Earlier this year, Greenspan and Shaw's team made a crucial advance.
They showed that flies do indeed sleep, nap and get tired when their
schedules are disrupted. "They'll be moving around, doing what flies
do--which is eating and having sex--and some of them will settle down
and become immobile," said Shaw, the lead author on a paper describing
the finding, which was published in the journal Science."


"The insects are remarkably similar to people: They sleep at night and
nap during the day."


"Shaw is confident enough to dub the behavior sleep because the
inactive flies do not respond quickly to disruptions from the outside
world--in this case to big pulses of sound from a boombox. Flies that
are awake respond to all pulses of sound; sleeping flies respond only
to the loud ones. Flies don't have rapid eye movement--or the "rapid
antennal move-ment" that observers have reported in bees."


"Shaw found that flies get sleepy when they miss their 40 winks. In
12-hour sessions, Shaw and his volunteers would sit in a room lit by
dim red ligh tand tap on the vials of flies that were trying to rest.
The flies exhibited a "sleep rebound." The longer they were deprived
of sleep, the harder they were to keep awake--to the point that Shaw
sometimes mistook very sleepy flies for dead ones.

Flies, like humans, got drowsy when they were given antihistamine sand
had trouble sleeping when caffeine was dissolved in their food. "It
woke them up," Shaw said.  And like those insomniacs, the flies were
much sleepier the following day.

The team also found that young flies, like infant babies, needed the
most sleep. Geriatric, month-old flies needed much less sleep and
often woke up in the middle of the night."


"Neurosciences Institute studies have shown that the flies do need
sleep, following much the same pattern as humans."


Where do bush flies sleep?

Bush flies sleep on vegetation. They keep off the ground. They like to
roost on the tips of leaves and twigs. For example, you can often find
them roosting on the tips of Spinifex grass.

If it's a warm night, a bright light will sometimes wake them up and attract them.


"The most extensive work has been carried out on fruit flies. "They
rest for 10 hours a night, and if you keep them awake longer, they
need to sleep more," said Giulio Tononi, a psychiatrist at the
University of Wisconsin.

The parallels between fruit flies and humans extend even to their
neurons. The two species produce, during part of the night,
low-frequency electrical activity known as slow-wave sleep. "The flies
surprised us with how close they were in many ways," Tononi said.

Discovering sleep in vertebrates and invertebrates alike has led
scientists to conclude that it emerged very early in animal evolution
? perhaps 600 million years ago. "What we?re doing in sleeping is a
very old evolutionary phenomenon," Lima said."

keyword search:

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Best regards,
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