Song of the Week: George Frideric Handel - O sleep, why dost thou leave me (from the oratorio Semele)

For those nights when it just won't happen. Clearly it also didn't happen in the 18th century when Handel wrote this aria, though the oratorio in which is features, 'Semele', is taken from Roman poet's Ovid's 'Metamorphoses'. Two millennia of sleeplessness then.