I’m jetting off to London tonight and while I was packing my in-flight skincare kit, it got me thinking about all my favourite overnight hydrating masks. It’s the one product that I won’t go on a long-haul flight without so I’ve tried quite a few. Here’s my pick of the top five locally available moisturising masks, and although they aren’t all billed as for use overnight specifically, you could safely leave them on until morning for an extra boost of hydration: Clinique Moisture Surge Overnight Mask (R395 for 100ml) – A creamy, oil-free night mask that helps skin replenish lost…