Fasting readings

Did you do a re-test to confirm it was so high and were your hands clean and the strip properly stored?

What have you been the previous few mornings?

Motherhen2014 said:

It's always 10 or 8 dry rarely 5 no I never retest always trust readings I keep strips in the metre case not near any heat and test after lol and hand wash.

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In that case I suggest it was your 5.4 that was a rogue reading. If any tests are genuinely unexpected you should do a re-test. We all get rogue tests for various reasons. If a test is within your normal range for that time of day, then no need to re-test.

When you got the 5 had you had any alcohol the night before?
Alcohol pushes blood sugars down A friend whos a consultant medic once told me that “ alcohol makes insulin work harder and longer” whether its your own insulin or injected insulin

As @Boo1979 mentions there are some things which can reduce your fasting BG.
Alcohol and exercise are the main two. The reason for this is related to your glucose reserves in your liver.
When it comes to alcohol, your liver is trying to do two things - flush out the toxins (alcohol) and drip glucose. A liver is a stereotypical male - it can only do one thing at a time. So it sorts out the poisons first which means it will not be dripping glucose so your BG will be lower.
When it comes to exercise, your body needs more glucose to exercise (which is why exercise often reduces BG). If you do not have enough glucose in your blood, your liver will release extra glucose during exercise. As a result, you have less glucose in your liver to drip over the next 24 to 48 hours. Hence, lower BG for the next day or so.

Alternatively, the 5.4 could just be a rogue measurement.
(Although, if I was in your shoes, I would have seen it as a positive and not retested - it keeps the average up )