That is ok not a problem but for 2 Nights you will feel a lot of restlessness but do not worry I will also advise you to start circling on a calendar date so circle and when you have taken your calcium tablet with blue colour and circle it with black colour when you take your iron tablets so that way you will be able to track if you have taken the related tablet or not I will advise you to take calcium with breakfast and this iron tablet you can take at meal time or lunch time or with evening snacks so you have two options for iron avoid taking iron at night it may cause constipation as well as bloating

Not an issue at all and my 2 cents to you always take iron tablet in the morning along with lemon juice or orange juice vitamin c helps in iron absorption, having iron tablet in the night might cause constipation . So iron in the morning and calcium in the night.