Treatment should focus on improving slow wave sleep (with pharmaceuticals, acoustic stimulation, TMS, TcDS) and optimising circadian timing (bright light and melatonin (sleep promoting) intervention) -- light can reduce cognitive deficits, have no deceleration of decline, reduce depressive symptomology, diminish gradual increase in functional limitations, melatonin can increased total sleep duration/uninterrupted sleep, diminish agitation when combined with light