Some great sacrifices are such as are made once in life, like that of life. Some are very minor but must be made continuously. Their continuing nature makes them important because of many intangible aspects:
Firstly, they require you to be ever-alert and watchful lest opportunities come and find you napping, indifferent, unmindful or unable to recognize them.
Secondly, they require a steady and constant will, which requires a greater effort to maintain it.
Thirdly, they are too small to qualify as acts of heroism. But they are no less effective for character-building, social organization and success. Even a drop of water falling steadily and persistently may make a hole in a rock.
Fourthly, they are not called forth in moments of crisis; rather they must be made in the ordinary run of daily living. Despite being minor in nature, this makes them harder to offer. For faced with a great challenge, under an acute crisis, looking forward to an immense reward, it is always easier to summon all your inner resources, to summon the greatest will, to offer the best. Such is human nature.
In a way we are required to make small, very small, sacrifices every moment in life. For at every step and every moment we are faced with a choice - however small - to go one way or to go the other way. Every choice made to please Allah means taking a decision to sacrifice something. Even, as you choose to offer Fajr (morning) Prayer, you sacrifice your sleep and the warmth of your bed.
There are sacrifices to be made in regular day to day living - in home, in work place, in market, in social contact, in organizational work, even in privacy - which are likely to be missed. They are more difficult to make simply because they are not even recognized as suitable stuff for sacrifice.
"Sacrifice: The Making of a Muslim" - Khurram Murad, pp. 27, 28