Fiddly, but insulin mistakes like this are quite common.
Generally, one should not stop the long acting, so I would give the Lantus as normal.
I have little to add to the novorapid advice above - have enough CHO to cover the novorapid and make sure glucose level OK before bed and check (I'd need an alarm clock) not low at 1-2 hours later and at 3.00 am-ish which is when night time hypos happen.
How to stop it happening again? Many of my patients on basal bolus with bedtime basal keep the basal by the bed and bolus wherever they eat.
I would not inject the two insulins in the same place at the same time normally (although it might have been quite interesting here) cos the lantus is slightly acidic to keep it in solution, but the novorapid is neutral pH and will be damaged by the acidic lantus. Not sure how much of an effect this is in real life, though.
Hope you are OK
Best wishes