Although the symptoms of sleepiness and tiredness
,I would suggest to get a repeat thyroid function test done after 6 weeks course of THYROXINE
.The modification of dose should be done only after the report comes.
The goal of treatment should be to keep TSH levels around 2,as this level is best level for pregnancy
to take place.
Other causes for tiredness and sleepiness,for example anemia,would have been ruled out by you.
Get her VIT D,serum calcium and VIT B12 level also checked up.