Forskning vedrørende daggrysimulatorer
Dette er bare en del af forskningen bag daggrysimulation og effekten under søvn, vækning, humør og energiniveauet.
Bemærkningerne er på engelsk ligesom de fulde videnskabelige resumeer.
Effects of artificial dawn on subjective ratings of sleep inertia and dim light melatonin onset.
Chronobiol Int. 2010 Jul;27(6):1219-41.
Sleep inertia is the term for when you’ve woken up but still feel half asleep. In this study, waking up with dawn simulation resulted in a significant reduction of sleep inertia complaints though there was no shift in melatonin production or other circadian rhythms. Read the full abstract
Controlled trial of naturalistic dawn simulation and negative air ionisation for seasonal affective disorder
Am J Psychiatry. 2006 Dec;163(12):2126-33.
This trial looked at the effect of awakening with light or ionisation on winter depression. There were five different treatment groups: all improved depression scores with bright light producing the best results and low density ionisation having only a modest effect. Dawn simulation and high density ionisation got a special mention as they were not only very effective, they had the added advantage of not requiring any extra time or effort! Read the full abstract
The effect of dawn simulation on the cortisol response to awakening in healthy participants
Psychoneuroendocrinology. 2004 Aug;29(7):925-30.
Twelve healthy volunteers used an early version of Lumie Bodyclock to wake them up. Samples were taken after waking and tested for cortisol, a hormone that helps to give the body a quick burst of energy and improve alertness. People waking up with our dawn simulators had significantly higher levels of cortisol and felt more awake. Read the full abstract
Effect of dawn simulation on quality of sleep - a community based trial
BMC Psychiatry. 2003 Oct 27;3:14.
Dawn simulation was useful in treating SAD and winter depression but would it benefit people in general? 100 volunteers used a dawn simulator at home and rated their quality of sleep each morning. After six days there were definite improvements but the effects didn't last once they'd stopped using their dawn simulator. For best results, use your Bodyclock every day. Read the full abstract
Is dawn simulation effective in ameliorating the difficulty awakening in seasonal affective disorder associated with hypersomnia?
J Affect Disord. 2002 May;69(1-3):231-6.
People with SAD often find it really hard to wake up and this study showed that dawn simulation could be of particular benefit. After one week of waking with dawn simulation, SAD sufferers were assessed and had considerably lower scores in respect of difficulty awakening and sleepiness. Read the full abstract
J Biol Rhythms. 2000 Oct;15(5):437-46.
Subjects were exposed to a controlled 24-hr cycle of very low light/darkness in which half the group started their 'day' with dawn simulation. After 6 days, hormone levels showed that those without dawn simulation were out of sync with their environment. Those that woke up with dawn simulation maintained their internal body clock suggesting that gradual change in light is a strong circadian signal. Read the full abstract
Dawn simulation vs. lightbox treatment in winter depression: a comparative study
Acta Psychiatr Scand. 1998 Jul;98(1):73-80.
61 people with winter depression were involved in this study. They received either 2hrs of morning bright light therapy at a clinic or tried dawn simulation at home. Patients in both groups felt better and this was reflected in their reduced depression scores, on average 57% lower in those using bright light and 40% lower with dawn simulation. Read the full abstract
A controlled study of dawn simulation in subsyndromal winter depression
Acta Psychiatr Scand. 1993 July;88(1):67-71
Dawn simulation resulted in marked improvement in a group of people with subsyndromal SAD (winter blues, rather than full SAD). A slow, gradual sunrise taking 45 minutes was much more effective than one lasting just a few seconds and subjects had better scores for energy, mood, social interest, productivity, quality of sleep and quality of awakening. Read the full abstract