For those that remember the John Kennedy Jr. mishap. Current pilot with instrument familiarity (required to get SEL license) airplane with good auto pilot and hazy night, not hard IFR. Piont being the deck is stacked against most US based glider pilots. However, with yearly or bi-yearly instrument training and an AH I believe your chances have increased to maintaining control for a minute or two, enough to get you out of the soup. In climbing we always "hoped for the best, excepted the worst and brought what we could". IN other words, train and equip your glider with AH then stay out of the clouds! If you get inadvertent IFR, you have given yourself a better chance of survival.