I think probably most type 1s have at some point confused basal and bolus and accidentally taken the wrong amount of the wrong one, it's very easily done, and it's easily monitored to correct.
If you take basal when you thought it was bolus, then take your bolus and correct through the night to check if you need to eat to avoid hypos.
If you take bolus when you thought it was basal then set alarms to test through the night and warn your partner/ family of the need to test through the night and want to do if you go hypo and make sure you have a decent amount (and more) of hypo treatment available and you have eaten lots of complex carbs to try to stave off the drop.
Usually if lots of carbs are eaten, up to the level of what you have over bolused by (use you your I:C ratio to do this: if you use I:C of 1:10 and have taken 32 units then you need to eat 320g of carbs- ie 14 slices of bread) before the insulin starts working, which is a probably not exactly what you are feeling like if you've eaten dinner and then brushed your teeth and gone to bed, but you need to eat before the bolus insulin you've just taken by mistake starts working (about 30min), then there is no need to panic and require medical assistance.
It is probably best to try and avoid the mistake by making sure pens are differently colours, or kept in different places, if you can.
