Bought this when the Toridden Dive In serum was out of stock. I think you can use it during day and night tbh, it is a little more watery than the Torriden one but it does the same job as Toridden. I just use a single pump for 1 layer, but you can double it as a sleep-in mask for night time. This can be my replacement when the Torriden serum is out of stock!