SAD

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seasonal affective disorder (SAD)

Cyclical depression occurring in winter, apparently caused by insufficient sunlight. It is most common in places at high latitudes and therefore with long winters and very short daylight hours. Symptoms can include all those of major depression, and there is a risk of suicide. The cause may be related to regulation of the body's temperature and hormones and may involve the pineal gland and melatonin. Exposure to intense full-spectrum light from a set of fluorescent bulbs in a light box with a diffusing screen has proved effective as treatment. Dawn simulation (exposure to low light levels in the final sleep period) and negative-ion therapy can also help.

SAD - Systems Analysis Definition

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No references found			A sad tale--yes, a sad tale; but all was sad in those days. Nada The Lily by Haggard, Rider H. View in context And the silken sad uncertain rustling of each purple curtain Thrilled me--filled me with fantastic terrors never felt before; So that now, to still the beating of my heart, I stood repeating "'Tis some visiter entreating entrance at my chamber door-- Some late visiter entreating entrance at my chamber door; This it is and nothing more. The Raven by Poe, Edgar Allan View in context Now I had lived in this happy place three years, but sad changes were about to come over us. Black Beauty by Sewell, Anna View in context			Sacré-Cour sacred Sacred Ibis Sacred Objects Sacred Places Sacred Wars Sacrifice sacrificial anode sacrificial compliant substrate sacrificial metal sacrificial protection sacrificial timber Sacrilege Sacripant sacristan Sacristy Sacrobosco, Johannes de sacrococcygeus sacroiliac sacrosanct sacrospinous Sacrum Sacsahuamán Sacy, Antoine Isaac, Baron Silvestre de Sacy, Silvestre de SAD Sad Sack SAD SAM Sadao Araki Sadat Sadat, Anwar Al- Sadat, Anwar el- Saddam Hussein Saddle saddle back saddle bar saddle bead saddle bend saddle board saddle coping saddle fitting saddle flange saddle flashing saddle fold saddle horse saddle joint saddle leather Saddle Mountain National Wildlife Refuge Saddle Mountain State Natural Area saddle notch saddle piece			SACU SACU SACUA SACUB SACUBO SACUPA SACUS SACV SACVB SACVD SACVEN SACVI SACVSD SACW SACWA SACWARNS SACWG SACWIS SACWU SACX Sacy, Antoine Isaac, Baron Silvestre de Sacy, Silvestre de SACYR SACYSL SACZ SAD SAD (disambiguation) SAD (disambiguation) SAD (disambiguation) SAD (disambiguation) Sad (letter) Sad bread Sad But True sad case Sad girl in snow Sad Ham Sad Ham Sad iron Sad iron Sad Lovers and Giants Sad Mackem Bastard Sad Music for Happy Humans SAD rabies vaccine sad sack sad sack sad sacks sad sacks SAD SAM sad sight sad state of affairs Sad To Say Sad To Say sad-faced Sad/Frown Sada SADAA

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